What is Version Control?
Version Control Systems (VCS) are tools that track changes to files over time. In modern software development, Git is the undisputed standard.
The Three Core Problems VCS Solves
- Time Travel: See exactly who changed what, when, and why. Roll back to any point in history.
- Collaboration: Multiple people work on the same code without overwriting each other.
- Branching: Create parallel development paths to test features without affecting the main product.
Why Git?
Centralized vs. Distributed
Centralized (SVN, Perforce)
- Single central server holds all history.
- If server goes down, no one can work.
- Network latency on every operation.
Distributed (Git)
- Every developer has a full copy of the entire project history.
- Work offline completely.
- No dependence on a central server.
- Much faster operations.
Core Concepts
Repository
A repository (or repo) is a directory that contains all project files and the complete history of every change.
Commits
A commit is a snapshot of your code at a point in time.
Action:
git add .
git commit -m "feat: add user authentication"Result:
[main a1b2c3d] feat: add user authentication
3 files changed, 45 insertions(+)
create mode 100644 src/auth.jsThe Three Areas
Git has three main areas where your code lives:
| Area | Purpose | Command |
|---|---|---|
| Working Directory | Your actual files on disk | Edit files directly |
| Staging Area | Changes staged for next commit | git add |
| Repository | Committed history | git commit |
What Comes Next
This tutorial series covers:
- Installing & Configuring Git
- Git Basics (Add, Commit, Log)
- Branching & Merging
- Remote Repositories (Push, Pull)
- Git Log & Advanced History
- Resolving Merge Conflicts
- Git Stash
- Git Rebase
- Cherry-picking & Reverting
- Git Tags & Releases
- Git Workflows (GitFlow, Trunk-based)
- Pull Requests & Code Reviews
- Git Hooks & Automation
- Advanced Git (Bisect, Blame, Submodules)
- Git Best Practices & Security