Git 101: version control คือระบบ save ที่มีความจำGit 101: version control is a save system with memory

Git is a version-control tool.

That sounds technical, but the useful idea is simple:

Git helps you save meaningful versions of a project, compare changes, and go back through history.

It is not the same thing as GitHub. Git is the tool. GitHub is one popular website where Git repositories can be shared.

Why Git matters

Without Git, project history often looks like this:

report-final.docx
report-final-v2.docx
report-final-v2-real-final.docx
report-final-v2-real-final-pichaya-edit.docx

Git gives you a cleaner system:

• one project folder
• saved checkpoints called commits
• messages explaining why each checkpoint exists
• a way to compare what changed
• branches for safe experiments

This matters for AI work because AI agents can edit many files quickly. Git gives you a way to inspect those edits before trusting them.

The core objects

Learn these words first.

You do not need to master every command today. You need a map.

Git is local first

Git works on your computer even without the internet.

You can:

• create a repository
• edit files
• check status
• commit changes
• create branches
• inspect history

Only sharing with another server needs a remote such as GitHub.

The beginner loop

The Git loop you will repeat most often is:

edit files
git status
git diff
git add
git commit

Read that as:

1. Change something.
2. Ask Git what changed.
3. Inspect the exact difference.
4. Choose what belongs in the next save point.
5. Save it with a message.

The safest habit is to run git status more often than you think you need.

What Git does not do

Git does not automatically understand whether your work is good.

It will happily save:

• broken code
• unclear documents
• secrets you should not commit
• generated files you did not mean to track

Git gives you memory. You still need judgment.

Practice: explain the map

Before running commands, fill this out:

Git is:

GitHub is:

A repository is:

A commit is:

A branch is:

The command I should run often is:

If you can explain those in plain language, the commands will make more sense.

Next: Git 102 - create a repo and read status.