What Is Version Control and Why Should Every Developer Use Git

[Seb51]

Version control is a system that tracks changes to files over time, allowing you to see every modification made, who made it, when, and why, and to revert to any previous state if something goes wrong. For software development it is as fundamental as saving your work, but far more powerful because it saves the entire history of your work rather than just the current state.

Git is the dominant version control system used by the overwhelming majority of software projects in 2026. Created by Linus Torvalds in 2005 to manage the Linux kernel, it is distributed rather than centralised, meaning every developer has a complete copy of the repository history rather than depending on a central server. GitHub, GitLab and Bitbucket are services built on top of Git that add collaboration features, issue tracking, code review workflows and CI/CD pipeline integration.

The core concepts to understand are commits, branches and merges. A commit is a snapshot of your code at a specific moment, accompanied by a message explaining what changed and why. A branch is a separate line of development that diverges from the main codebase, allowing you to work on a feature or fix without affecting the main code until it is ready. A merge brings branches back together. The workflow this enables, develop a feature in isolation, test it, review it, then merge it, is the foundation of almost all professional software development.

For AI-assisted development in 2026 Git has become even more important, not less, because AI coding tools generate large amounts of code quickly and the ability to review exactly what changed, revert to a known good state when an AI-generated change introduced a bug, and track which changes came from AI assistance versus human decisions, all require robust version control. The Miasma supply chain attack was possible partly because the malicious commit was a small change in a large repository, which underlines why reviewing commits carefully before incorporating them matters.

[Stu96]

Git became mandatory for me the first time I broke a project badly enough that I wanted to go back to the previous day's state and could not. Learning Git after that incident was not optional

[Danny47]

The commit message discipline is underrated as a skill. A commit message that says fixed bug tells you nothing useful when you are debugging six months later. A commit message that says fix null pointer exception in user authentication when session token is empty tells you exactly what to look for

[TeaAndCode72]

Branches are what separate professional development from amateur development. Working on the main branch directly is the equivalent of editing a published document without a draft. The branch is the draft

[Grim Tracey]

Git blame is the most politically sensitive command in most development teams. It tells you who wrote every line of code. Used with care it is an invaluable debugging tool. Used carelessly it becomes blame assignment

[CodyRhodes99]

AI coding tools and Git work well together specifically because you can commit before running an AI-generated change and then compare what the AI actually did to the diff. This is how you build understanding of what the AI is doing rather than just accepting its output

[BrightRunner]

The distributed nature of Git means your repository is safe even if your remote host goes down because every developer has the full history. This was not true with older centralised systems like SVN where losing the server meant losing everything

[Highland Dylan]

Pre-commit hooks that run tests before every commit are one of the best investments of an hour a developer can make. Catching failures at commit time rather than at merge request time saves enormous amounts of debugging time