What Git is and how it works: a beginner guide (with the essential commands)

Git is the tool programmers use to track changes to code. It is a non-negotiable skill: any developer job takes it for granted, and using it well immediately sets you apart from someone who only "watched a course". The good news is that the core concepts are few.

The problem Git solves

Imagine writing a program and, after days of work, breaking something without knowing what. Without Git, you are in trouble. With Git you can go back to any saved point, like the save files of a video game: every time something works, you make a "save" (a commit) and you are safe.

On top of that, Git lets several people work on the same project without stepping on each other. It is the reason GitHub exists.

The concepts to grasp

• Repository (repo): your project folder under Git control, with all its history.
• Commit: a save with a message describing what you changed ("added login").
• Branch: a parallel line of development to try something without touching the working version.
• Remote / push: an online copy of the repo (e.g. on GitHub); push means sending your commits up there.

The commands you will use every day

Initialise a repo and make your first save:

git init
git add .
git commit -m "First commit"

git add picks what to save, git commit makes the save with a message. This pair is the gesture you will repeat thousands of times.

See status and history:

git status
git log --oneline

Work with GitHub (send your code online):

git remote add origin https://github.com/yourname/project.git
git push -u origin main

Try something on a separate branch and then merge it:

git checkout -b new-feature
git commit -m "Work on the new feature"
git checkout main
git merge new-feature

Practical advice

Don't memorise Git: use it. Create a repo for every exercise or project, make small frequent commits with clear messages, and publish to GitHub. After a week the commands will feel natural — and you will also have a public portfolio, which at interviews counts more than a certificate.

Where to go from here

Git shines when you have real code to version. On LevelUpCode you build that code with exercises and guided projects to put straight under Git and on GitHub: the paths start from zero and the first chapters are free.