What Is Git? A Beginner’s Guide to Version Control

Over 93% of developers use Git as their primary version control system. If you write code, you’ll run into it eventually. There’s no avoiding it.

So what is Git, exactly? It’s a distributed version control system that tracks changes in source code, lets teams work on the same project without overwriting each other’s work, and keeps a complete history of every file modification. Linus Torvalds built it in 2005 for the Linux kernel, and it took over the entire industry within a decade.

This article covers how Git tracks changes, how branching and merging work, the core commands you’ll actually use, the difference between Git and platforms like GitHub, and how to fix the mistakes that trip up most developers.

What is Git

Git is a distributed version control system that tracks changes in source code during software development. Linus Torvalds built it in 2005 after the Linux kernel team lost access to BitKeeper, the proprietary tool they’d been using since 2002.

The whole thing came together in about 10 days. Torvalds made the first commit on April 7, 2005, and by late June, Git was already managing the Linux kernel 2.6.12 release.

What makes Git different from older systems like SVN or CVS is that every developer gets a full copy of the entire repository, complete history included. There’s no single server holding everything. If the remote goes down, every local clone is a complete backup.

RhodeCode data from 2025 shows Git adoption rose from 87.1% in 2016 to 93.87% among developers. 6sense reports Git holds 86.32% of the version control market, with Microsoft Azure DevOps Server at 9.66% and everything else well behind.

The version control market itself is growing fast. Grand View Research valued it at $1.03 billion in 2024, projecting $2.66 billion by 2030 at an 18.6% CAGR. That growth tracks directly with the rise of distributed workflows, remote teams, and DevOps practices.

Git is free and open source under the GPLv2 license. Junio Hamano has maintained it since July 2005, when Torvalds handed off the project to focus on the kernel. Torvalds later joked that his daughter told him he was more famous at her college’s CS lab for Git than for Linux.

How Git Tracks Changes

Most people assume version control works by saving file differences. Git doesn’t do that. It takes a snapshot of your entire project every time you commit. If a file hasn’t changed, Git stores a reference to the previous identical file instead of duplicating it.

This snapshot-based approach is one of the reasons Git is fast, even on large projects.

Your files move through three states inside Git. Understanding these three states is basically the whole mental model you need.

Working directory: where you edit files normally on your machine. Staging area (index): where you prepare specific changes for the next commit. Repository (.git directory): where committed snapshots and the full project history live.

Every object Git stores, whether it’s a commit, a tree structure, or a file blob, gets identified by a SHA-1 hash. That 40-character string acts as both a unique ID and a data integrity check. If even one byte changes, the hash changes completely.

The .git directory at the root of your project holds everything: objects, refs, the HEAD pointer, configuration. Delete that folder and you lose your entire local history.

Hutte research shows 92% of projects using Git enforce code review before merging changes, and roughly 95% run tests before committing. The snapshot model makes this possible because each commit is a self-contained, verifiable state of the project.

The Commit Graph

Commits don’t just sit in a list. Each one points to its parent commit (or parents, in the case of a merge), forming a directed acyclic graph, or DAG.

HEAD is a pointer that tells Git which commit you’re currently working from. Usually it points to a branch name, which itself points to the latest commit on that branch. When HEAD points directly to a commit instead of a branch, you’re in what’s called a detached HEAD state.

This graph structure is what lets Git handle branching and merging so efficiently. Looking at the Git log output shows you this graph in action, with each commit hash representing a node.

Git Branching and Merging

Branches in Git are just lightweight pointers to commits. Creating a new branch takes milliseconds because Git only writes a 41-byte file containing a commit reference. Compare that to SVN, where branching meant copying the entire directory tree on the server.

That cheapness changes how you work. Developers spin up branches constantly, for features, bug fixes, experiments. The cost is essentially zero.

Git’s default merge strategy uses a three-way merge algorithm. It compares the two branch tips against their most recent common ancestor to figure out what changed and where.

A fast-forward merge happens when the target branch hasn’t moved since you branched off. Git just slides the pointer forward. No merge commit needed.

A three-way merge creates a new merge commit with two parents when both branches have diverged. If the same lines were changed in both branches, Git stops and flags a merge conflict for you to resolve manually.

DEV Community data indicates about 87% of Git users have dealt with merge conflicts at some point. Developer surveys suggest these conflicts eat up 10-20% of time in collaborative projects. That’s roughly half a day per week spent sorting through conflicting changes instead of writing code.

Common Branching Strategies

Git Flow uses long-lived develop and main branches with separate feature, release, and hotfix branches. It works well for teams with scheduled releases, but the overhead gets heavy for smaller projects. You can dig deeper into how Git Flow works if structured releases are your thing.

GitHub Flow keeps it simpler. One main branch. Short-lived feature branches. Pull requests for review. Merge and deploy. Good fit for teams doing continuous deployment.

Trunk-based development pushes everyone to commit directly to the main branch (or very short-lived branches), using feature flags to hide unfinished work. Google and Microsoft use this approach at scale. More on trunk-based development and why large teams gravitate toward it.

Gartner survey data from 2024 shows 75% of global software development teams fully adopt agile methodologies, and the branching strategy you pick usually mirrors your team’s release cadence and size.

Core Git Commands

Git has hundreds of commands. You’ll use maybe 15 of them regularly. The rest exist for edge cases that come up once a year, if that.

There’s a distinction Git makes internally between porcelain commands (the user-friendly ones you type daily) and plumbing commands (low-level operations that power the porcelain). You almost never need plumbing commands unless you’re scripting or debugging something weird.

Here are the commands that actually matter for daily work:

Starting and getting code:

• git init creates a new repository in the current directory. What git init does under the hood is create that .git folder with the full object database.
• git clone copies a remote repository to your machine, including the entire history.

Staging and committing:

• git add moves changes from the working directory to the staging area
• git commit saves the staged snapshot to the local repository
• git status shows which files are modified, staged, or untracked

Branching and merging:

• git branch lists, creates, or deletes branches
• git switch (or the older git checkout) moves between branches
• git merge combines branch histories together

Syncing with remotes:

• git push sends local commits to the remote repository
• git pull fetches remote changes and merges them into your current branch
• git fetch downloads remote changes without merging (safer for checking first)

A full reference of Git commands covers the less common operations like cherry-pick, bisect, and reflog. But the ones above handle about 90% of what you’ll do on any given day.

Hutte statistics show 70% of developers have used a Git command without fully understanding what it did. The command line is still the primary way most developers interact with Git, according to Stack Overflow’s 2022 survey.

Local and Remote Repositories

Every Git repository on your machine is a complete, standalone copy. Full history, all branches, every commit. This is what “distributed” actually means. You can commit, branch, view logs, and diff entirely offline.

The remote is just another copy of the repository, typically hosted on a server, that your team agrees to treat as the shared reference point.

When you run git clone, Git automatically names the source remote origin. You can add more remotes with different names. Upstream is the conventional name for the original project when you’re working from a fork.

The difference between git fetch and git pull trips up a lot of people. Fetch is the safe option. It gets the data without touching your working branch. Pull does a fetch plus an immediate merge, which can create conflicts if your local branch has diverged.

Cloning vs. forking is another common point of confusion. Cloning copies a repository to your local machine. Forking (a concept from GitHub, GitLab, and similar platforms) creates a server-side copy under your own account. You fork when you don’t have write access to the original.

GitHub reported hosting over 400 million repositories as of 2024, with more than 5 billion contributions across public and private projects that year alone. Over 90% of Fortune 100 companies use GitHub in their development workflows.

Git Hosting Platforms

Git is not GitHub. This is probably the single most common misconception beginners have. Git is the version control tool that runs locally. GitHub, GitLab, and Bitbucket are hosting services that store remote Git repositories and add collaboration features on top.

GitHub

Microsoft acquired GitHub in 2018 for $7.5 billion, and it remains the largest platform by far. GitHub hosts over 150 million developers worldwide with more than 400 million repositories.

What GitHub adds beyond Git hosting: pull requests, issue tracking, project boards, GitHub Actions for CI/CD automation, and GitHub Copilot for AI-assisted coding. Copilot alone surpassed 15 million users and reached $2 billion in annualized revenue by mid-2024.

The 6sense data puts GitHub’s share of the version control platform market at 67.8%.

GitLab

GitLab takes a different approach. It bundles source control, CI/CD, security scanning, and project management into a single platform. The “single application for the entire DevOps lifecycle” pitch.

GitLab’s SaaS revenue grew 39% year-over-year in fiscal Q2 2026. Automotive companies like Jaguar Land Rover reportedly cut feedback cycles by 99% after moving to GitLab’s unified environment.

It’s popular with teams that want everything in one place and don’t want to stitch together GitHub plus Jenkins plus Jira plus a separate security scanner.

Bitbucket

Atlassian’s Bitbucket holds 7.2% of the VCS platform market. Its strength is tight integration with Jira and Confluence, which makes it the default choice for teams already deep in the Atlassian ecosystem.

Bitbucket is adding EU data residency support in 2026, targeting regulated industries that need geographic control over where code is stored.

Each platform layers on features that Git itself doesn’t have: code review workflows, permissions, continuous integration pipelines, and project tracking. The choice usually comes down to what other tools your team already uses and whether you prefer an integrated suite or a best-of-breed stack built from API integrations.

Git vs. Other Version Control Systems

Git won. That’s the short version. But knowing why it won, and where it still falls short, matters if you’re choosing tools for a team or maintaining legacy systems.

Git vs. SVN

The biggest difference is structural. SVN uses a centralized model where one server holds the truth. Git gives every developer a full copy of the entire repository history.

That means Git works offline. You can commit, branch, and view history without a network connection. SVN can’t do any of that.

Branching in SVN copies the whole directory tree. In Git, it creates a 41-byte pointer file. The speed difference is massive on large projects.

RhodeCode reports that organizations like NASA, Siemens, and Citigroup still use SVN for its structured access control and stability with large binary assets. SVN isn’t dead, it’s just limited to specific environments where those features matter more than distribution.

Git vs. Mercurial

Mercurial launched in 2005, just 12 days after Git’s first release. Both are distributed. Both use snapshot-based tracking. Perforce data shows Mercurial holds roughly 2% of the VCS market.

Stack Overflow’s retrospective on the competition put it bluntly: GitHub gave Git a web UI, and Mercurial couldn’t match the feature volume that Git’s contributor community produced.

Mercurial’s syntax is simpler. Its documentation is easier to follow. But the ecosystem advantage is overwhelming at this point, and Bitbucket dropped Mercurial support entirely in 2020.

Git vs. Perforce

Large binary files are Git’s weak spot. Game studios working with terabyte-scale art assets often hit performance walls that Git LFS only partially solves.

Perforce Helix Core handles these scenarios better, with file-level locking and optimized transfer speeds. Epic Games uses Perforce for exactly this reason.

For source code, though, Git wins on speed, flexibility, and cost. Perforce requires commercial licensing. Git is free.

Why Git became dominant

Three things aligned. Git’s distributed model fit how open-source projects actually work. GitHub launched in 2008 and made Git accessible to developers who weren’t command-line experts. And network effects kicked in hard.

Fortune Business Insights data shows 90% of tech startups rely on version control systems as basic development infrastructure. For nearly all of them, that means Git.

RhodeCode’s 2025 analysis confirmed that Git adoption climbed from 87.1% in 2016 to 93.87%. The gap keeps widening because every new developer learns Git first, and switching costs for established teams are high.

How Git is Used in Real Development Workflows

Knowing Git commands is one thing. Knowing how Git actually fits into a team’s daily routine is different. The tool itself is just plumbing. The workflows built on top of it are what make the software development process work.

Pull requests and code review

Almost every team using Git runs code through a pull request (or merge request, depending on the platform) before it hits the main branch.

Hutte research shows 92% of projects using Git enforce code review before merging. The pull request isn’t a Git feature itself. It’s a platform feature from GitHub, GitLab, and Bitbucket that layers a discussion and approval process on top of Git’s merge mechanics.

DEV Community’s 2026 best practices guide recommends keeping PRs under 400 lines changed for faster, more effective reviews.

CI/CD pipelines triggered by Git events

Every push, tag, and merge can trigger automated actions.

• A commit to a feature branch runs unit tests automatically
• Merging into main triggers a build pipeline and deployment
• Tagging a release version kicks off a full release cycle

Mordor Intelligence reports GitHub Actions consumed 11.5 billion minutes during 2024-2025, a 35% year-over-year increase. That’s a clear sign of how tightly Git events and automation are coupled now.

Monorepos vs. multi-repo setups

Google keeps virtually all of its code in a single massive repository. Most smaller companies split things into multiple repos, one per service or application.

Git handles multi-repo setups well out of the box. Monorepos push Git harder, often requiring tools like Git LFS, sparse checkouts, or custom solutions (Microsoft built VFS for Git specifically to manage the Windows codebase).

Open-source contribution workflows

Hutte data indicates about 55% of open-source projects on platforms like GitHub prefer contributors to fork the repository before submitting pull requests.

The typical flow: fork the repo, clone your fork locally, create a new branch, make changes, push, then open a PR against the original project’s main branch. It’s the same Git operations, just across two different remote copies.

Common Git Mistakes and How to Fix Them

Git is powerful. It’s also surprisingly easy to mess up if you don’t know the recovery commands. The good news is that Git almost never truly loses data. There’s usually a way back.

Hutte statistics show 90% of developers believe continuous learning and training are needed to avoid and solve Git problems. About 55% find Git rebase to be challenging and error-prone.

Undoing a commit

Three tools, three levels of severity:

• git commit --amend rewrites the last commit message or adds forgotten files
• git revert creates a new commit that undoes a previous one (safe for shared branches)
• git reset moves the branch pointer backward, which can discard commits entirely

The rule of thumb: use revert on anything that’s already been pushed. Use reset only on local commits nobody else has seen.

Recovering lost work with git reflog

Deleted a branch by accident? Made a reset you regret? The reflog is your safety net.

Git records every HEAD movement in a local log that persists for 30 days by default. Even “deleted” commits are still in the object database until garbage collection runs. The git reflog command shows this history, and you can restore almost anything from it.

Fixing merge conflicts step by step

Nearly 90% of developers have dealt with merge conflicts, according to Hutte. And about 45% have been hurt by a colleague’s force push, so you’re definitely not alone in this.

When a conflict happens, Git marks the affected files with conflict markers (<<<<<<<, =======, >>>>>>>). You edit the file to keep the code you want, remove the markers, stage the file, and commit. Learning to resolve merge conflicts in Git cleanly is probably the single most useful skill beyond basic commit/push/pull.

Removing sensitive data from history

Accidentally committed an API key or password? A regular git rm only removes it from the current state. The file still lives in the commit history.

BFG Repo-Cleaner is the standard tool for scrubbing sensitive data from Git history. It’s faster and simpler than the built-in git filter-branch command. After running it, you’ll need to force push, which means coordinating with your team first.

GitHub data from 2023 showed U.S. users exposed 12.8 million secrets in public repositories, a 28% increase from the prior year. A .gitignore file configured properly from the start prevents most of these mistakes.

Installing and Setting Up Git

Getting Git running takes about five minutes on any operating system. The setup process is straightforward, but skipping the initial configuration steps means your commits won’t have proper author information.

Installation by platform

Windows: Download Git for Windows from git-scm.com. The installer includes Git Bash, a command-line terminal that gives you a Unix-like shell on Windows.

macOS: Run xcode-select --install to get Git through Xcode Command Line Tools. Or install via Homebrew with brew install git.

Linux: Use your package manager. sudo apt install git on Debian/Ubuntu, sudo dnf install git on Fedora.

Stack Overflow’s 2022 survey found that the command line remains the primary way developers interact with Git. But GUI tools like those built into VS Code or standalone apps like Sourcetree lower the barrier for people who find the terminal intimidating.

Initial configuration

Two commands you should run immediately after installing:

git config --global user.name "Your Name" git config --global user.email "you@example.com"

This information gets attached to every commit you make. Without it, your commits show up with a blank or system-default author, which creates headaches later when you’re trying to trace who changed what.

The git config system has three levels: system (all users), global (your user account), and local (single repository). Most people set their name and email at the global level and only override per-repo when using a different identity for work versus personal projects.

SSH key setup

Password-based authentication for Git over HTTPS is being phased out. GitHub dropped support for it in 2021. SSH keys are now the standard method.

Generate a key pair with ssh-keygen, add the public key to your GitHub (or GitLab, Bitbucket) account, and Git authenticates automatically on every push and pull. No passwords to type or store.

Hutte data shows 50% of developers have had issues with SSH keys or other authentication methods at some point. Most of these come down to generating the key but forgetting to add it to the hosting platform, or having multiple keys without a proper SSH config file.

FAQ on What Is Git

What is Git used for?

Git is used to track changes in source code during software development. It lets multiple developers work on the same project simultaneously without overwriting each other’s work, while maintaining a complete revision history of every file.

Is Git the same as GitHub?

No. Git is a distributed version control system that runs locally on your machine. GitHub is a hosting platform that stores remote Git repositories and adds collaboration features like pull requests and issue tracking on top.

Who created Git?

Linus Torvalds created Git in April 2005. He built it in roughly 10 days after the Linux kernel team lost access to BitKeeper, their previous version control tool. Junio Hamano has maintained the project since July 2005.

Is Git free to use?

Yes. Git is free and open source software released under the GPLv2 license. You can download, use, and modify it at no cost. Hosting platforms like GitHub and GitLab offer free tiers alongside their paid plans.

What is a Git repository?

A Git repository is a storage location that holds your project files along with the entire history of changes made to them. Every clone of a repository contains the full commit history, branches, and tags.

What is a branch in Git?

A branch is a lightweight pointer to a specific commit. It lets you develop features or fix bugs in isolation from the main codebase. Creating a branch in Git takes milliseconds because it only writes a small reference file.

What does git commit do?

The git commit command saves a snapshot of your staged changes to the local repository. Each commit gets a unique SHA-1 hash and includes a message describing what changed. Commits form the building blocks of your project history.

What is the difference between git pull and git fetch?

Git fetch downloads changes from the remote repository without merging them. Git pull does both: it fetches and then automatically merges remote changes into your current branch.

Do I need to know Git to get a developer job?

Practically, yes. HackerRank reports 87% of tech recruiters look for Git knowledge on junior developer resumes. It’s a baseline expectation across almost every software development role.

How hard is Git to learn?

The basic commands (clone, add, commit, push, pull) take an afternoon to pick up. Branching and merging take a bit longer. The steep part is advanced operations like rebase and interactive staging, but most daily work only uses a handful of commands.

Conclusion

Understanding what is Git comes down to grasping one idea: it’s a distributed version control system that records every change to your project as a snapshot, not a diff. That single design decision is why it handles branching, merging, and offline work better than anything else.

Whether you’re working on front-end development, back-end development, or managing a mobile application development project, Git is the tool holding the workflow together. It connects local repositories to remote ones, powers CI/CD automation, and gives every developer on the team a full copy of the project history.

The learning curve is real but short. Start with commit, push, pull, and branch. Get comfortable with Git workflows and version control concepts. The rest you’ll pick up as you need it.

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Bogdan Sandu

Bogdan Sandu specializes in web design, focusing on creating user-friendly websites, and innovative UI kits.

Many of his resources are available on various design marketplaces and for free on Codepen.

Over the years, he's worked with a range of clients and contributed to design publications like Design Your Way, Designmodo, WebDesignerDepot, WPDean, and Speckyboy, and Slider Revolution among others.

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