What Is Git? An Introduction to Version Control

01What Is a Version Control System?

Does keeping a document by copying it as “final,” “final-real,” “final-this-one-for-sure” sound familiar? A version control system is the orderly and reliable version of that mess. It records every change along with who made it, when and why.

In software, this record is vital. If a feature that worked yesterday broke today, you can see the changes in between line by line and go back to the old state if needed. As a team grows, working without this setup becomes almost impossible.

Git came about in 2005 for the development of the Linux kernel and is today the most widely used version control tool in the world. The official documentation and download links are at git-scm.com.

02What Is Git Used For?

Git's value goes well beyond taking backups. Used correctly, it reorganizes the way a team works from the ground up.

Even for a developer working alone, the difference is big. To try a new idea you don't need to copy the project; you open a branch, try it, and delete it if you don't like it. The main version always stays clean and working, and the cost of experimenting drops to almost zero.

• Keeps the history: every save point is a snapshot of the project at that moment.
• Makes rolling back easy: you can undo a faulty change with a single command.
• Enables parallel work: everyone works on their own branch and merges later.
• Makes responsibility visible: it is clear who changed which line and why.
• It is distributed: every developer has a full copy of the project on their computer, so you can work without the internet.
• It connects to the release process: testing and going live can be automated by tying the steps to specific branches.

03Core Concepts: Repository, Commit, Branch

The shortest way to understand Git is to get four concepts settled. The commands are built on top of these concepts.

Repository

A repository is the folder that holds the project's files and the entire change history. A hidden .git folder keeps this history. The repository on your computer is called the local repository, and the one on a server such as GitHub or GitLab is called the remote repository.

What is a commit?

A commit is a described record of the changes made at a particular moment. Every commit has a unique ID. A good commit is small and single-purpose, and its message answers the question “what changed and why.”

Staging area

In Git, changes aren't saved directly; they are first added to the staging area. That way, out of ten files you changed at the same time, you can put just the three that are related into one commit.

Branch and merge

A branch is an independent line of work split off from the main code. You develop a new feature on a separate branch and, when it is ready, combine it into the main branch with a merge. That way, unfinished work doesn't break the working version.

04Basic Git Commands

After installing Git, most of the daily work runs on a handful of commands. For the setup steps, see our installing Git guide. The commands below work the same way on Windows, macOS and Linux.

git --version
git config --global user.name "Your Full Name"
git config --global user.email "eposta@ornek.com"
mkdir proje && cd proje
git init

git status
git add index.html
git add .
git commit -m "Add home page heading"
git log --oneline

git switch -c iletisim-formu
# ... make changes and commit ...
git switch main
git merge iletisim-formu
git branch -d iletisim-formu

git clone https://github.com/kullanici/proje.git
git pull
git push origin main

05A Typical Git Workflow

Even in a small team, the flow below prevents most of the confusion.

1. Pull the latest code: update the main branch with git pull before you start work.
2. Create a new branch: make a separate branch for each feature or fix.
3. Make small commits: save every logical step with a descriptive message.
4. Push the branch to the remote repository: share your work with git push.
5. Ask for a review: open a pull request on GitHub or a merge request on GitLab.
6. Merge after approval: only reviewed code should enter the main branch.

06The Difference Between Git and GitHub

This is the most commonly confused topic. Git is a tool; it runs on your computer and keeps the history. Services such as GitHub, GitLab and Bitbucket are platforms that host Git repositories on the internet and add review, task tracking and automation on top.

You can use Git entirely on your own without connecting it to any platform. For teamwork and backup, however, using a remote repository has become standard in practice.

07.gitignore and a Good Commit Message

Every repository should have a .gitignore file that says what is not tracked. Dependency folders, build output, log files and environment variables go on this list. That way the repository stays small, files that can be regenerated don't bloat the history, and secrets aren't shared by accident.

A commit message is a note you will read six months from now. A common habit is to write a short summary of about 50 characters on the first line, in the imperative mood: something like “Fix rounding error in cart total.” If needed, explain the reason and the effect after a blank line.

Good messages aren't only about tidiness. When you want to find which change introduced a bug, the git log and git blame commands point you straight to it; descriptive messages cut that search down to minutes. Agreeing on a shared message format within the team also speeds up code review.

node_modules/
dist/
.env
*.log
.DS_Store

08Common Beginner Mistakes

Most of these mistakes disappear on their own after a few weeks of practice. What matters is building the habit of small, well-described commits from day one.

• Committing secrets: passwords and API keys must not go into the repository; add files such as .env to .gitignore.
• Giant commits: putting a week's work into a single commit makes rolling back harder.
• Meaningless messages: write what changed instead of “fix” or “asdf.”
• Working directly on the main branch: unfinished work can break the live version.
• Being afraid of conflicts: a merge conflict is normal; Git shows you clearly which lines conflict.
• Adding folders such as node_modules: don't put files that can be regenerated into the repository.

09Where Should You Start Learning Git?

The most effective way is to manage a small project from start to finish with Git. A simple HTML page, or a small script of the kind we described in our what is JavaScript article, is enough to cement the concepts.

As a next step, you can set up a Node.js project and try package files, .gitignore and branches together. For the question of whether to keep interface and server code in the same repository or in separate ones, our frontend vs backend article is a guide.

In professional projects, Git is the invisible but indispensable backbone of the work. At Aurora Yazılım, all of our web design, corporate website and e-commerce infrastructure projects are run under version control, so every change stays traceable and reversible.