Git and GitHub: Version Control Every Developer Must Know

Git is the version control system used by virtually every software team in the world. GitHub is the platform where most code is hosted, reviewed, and collaborated on. If you want to work as a developer, Git and GitHub are non-negotiable skills.

This lesson teaches you the essential Git and GitHub commands and workflows you need from day one.

What Git does and why it matters

Git tracks every change you make to your code. Think of it as an unlimited undo system with branching timelines:

Every change is recorded as a commit — a snapshot with a message explaining what changed
Branches let you work on features independently without breaking the main code
You can merge branches together when a feature is complete
If something breaks, you can revert to any previous commit instantly
Multiple developers can work on the same project simultaneously without conflicts

Without Git, teams would overwrite each other's work constantly. With Git, every change is tracked, attributable, and reversible.

Essential Git commands

These are the commands you will use daily:

git init — initialize a new Git repository
git add . — stage all changed files for commit
git commit -m "message" — save a snapshot of staged changes
git branch feature-name — create a new branch
git checkout feature-name — switch to a branch
git merge feature-name — merge a branch into the current branch
git push — upload commits to a remote repository (GitHub)
git pull — download and merge changes from the remote

GitHub collaboration workflow

The standard GitHub workflow for teams:

Create a branch for your feature (git checkout -b feature/login-page)
Write code and commit regularly with clear messages
Push your branch to GitHub (git push -u origin feature/login-page)
Open a Pull Request (PR) describing what you changed and why
Team members review the PR, leave comments, request changes
After approval, merge the PR into the main branch
Delete the feature branch — it served its purpose

This workflow ensures code quality, knowledge sharing, and a clean project history.

When evaluating git, start with the fundamentals: what problem it solves, who it serves, and how it compares to the alternatives buyers consider first.

Start with the fundamentals. Define who you are serving, the single outcome you want, and the budget you are comfortable committing before you compare any options.

A practical rule is to favour clarity over cleverness. The choice that is easiest to understand, spell, remember and act on tends to win over the long run.

Context changes the answer. What is optimal for a fast-moving startup is rarely optimal for an established brand, so weigh your own stage, market and ambitions.

Avoid the common mistakes: rushing the decision, copying competitors blindly, and ignoring the total cost of ownership beyond the very first year of use.

Think in terms of trade-offs rather than a single perfect answer. Every option trades memorability, cost, reach and flexibility in a slightly different mix.

Document your reasoning. Writing down why you chose one path makes it far easier to revisit the decision later and to explain it to partners and investors.

Test with real people. A quick check with a handful of your actual customers will surface problems that no amount of internal debate ever reveals.

Plan for growth. The option that fits today should still make sense when your audience, catalogue or team is several times larger than it is right now.

Finally, revisit the decision periodically. Markets, tools and best practices move quickly, and a choice that was ideal last year may deserve a fresh look today.