What is Git?

Git is the world's most widely used version control system — a tool that tracks changes to files over time and allows multiple people to collaborate on the same codebase without overwriting each other's work. Whether you're a solo developer or working on a team of hundreds, Git is an essential part of every modern software workflow.

The Problem Git Solves

Before version control, developers saved files like project_v1.js, project_v2_final.js, and project_final_REAL.js. This approach is error-prone, wastes space, and makes collaboration nearly impossible. If something broke, you had no reliable way to see exactly what changed or roll back safely.

Git solves all of these problems by maintaining a complete history of every change ever made to a project.

What is Version Control?

Version control is a system that records changes to files over time so you can:

Recall any earlier version of a file or project at any point
See who made which changes and when
Work on experimental features without risking the stable version
Merge contributions from many developers

Git is Distributed

Unlike older centralised systems (such as SVN), Git is distributed. Every developer has a full copy of the repository — including the complete history — on their own machine. You can commit, branch, and merge entirely offline. The remote server (such as GitHub) is simply a shared synchronisation point, not a single source of truth.

Key Concepts at a Glance

Repository (repo): A folder tracked by Git, containing your files and their full history.
Commit: A snapshot of your project at a specific moment in time.
Branch: An independent line of development.
Merge: Combining changes from one branch into another.
Remote: A copy of the repository hosted on a server like GitHub or GitLab.

A Brief History

Git was created by Linus Torvalds in 2005 to manage the Linux kernel source code. The Linux project had thousands of contributors and needed a fast, reliable, distributed system. Git was designed with speed and data integrity as core requirements, and those principles still define it today.

Why Learn Git?

# Git is everywhere
git --version

Git is used by virtually every professional software team on the planet. It underpins platforms like GitHub, GitLab, and Bitbucket. Job postings for developers almost universally list Git as a required skill. Knowing Git means you can contribute to open-source projects, collaborate on team codebases, and manage your own projects with confidence.

What You Will Learn

By the end of this course you will be able to:

Install and configure Git on your machine
Create and manage repositories
Stage and commit changes with clear, meaningful messages
View the full history of a project
Create and switch between branches
Merge branches and resolve conflicts
Push and pull from remote repositories
Collaborate through pull requests
Undo mistakes safely

Git has a reputation for being intimidating, but its core workflow is straightforward. Let's build that foundation step by step.