Phase 00 - Lesson 02

Git & Collaboration

Version control is not optional. Every experiment, every model, every lesson you build here gets tracked.

Type: Learn Languages: -- Prerequisites: Phase 0, Lesson 01 Time: ~30 minutes

Learning Objectives

Configure git identity and use the daily workflow of add, commit, and push
Create and merge branches for isolated experiments without breaking main
Write a .gitignore that excludes model checkpoints and large binary files
Navigate the commit history with git log to understand project evolution

The Problem

You're about to write hundreds of code files across 20 phases. Without version control you will lose work, break things you can't undo, and have no way to collaborate with others.

Git is the tool. GitHub is where the code lives. This lesson covers what you need for this course and nothing more.

The Concept

sequenceDiagram
    participant WD as Working Directory
    participant SA as Staging Area
    participant LR as Local Repo
    participant R as Remote (GitHub)
    WD->>SA: git add
    SA->>LR: git commit
    LR->>R: git push
    R->>LR: git fetch
    LR->>WD: git pull

Three things to remember:

Save often (git commit)
Push to remote (git push)
Branch for experiments (git checkout -b experiment)

Build It

Step 1: Configure git

git config --global user.name "Your Name"
git config --global user.email "you@example.com"

Step 2: The daily workflow

git status
git add file.py
git commit -m "Add perceptron implementation"
git push origin main

Step 3: Branching for experiments

git checkout -b experiment/new-optimizer

# ... make changes, commit ...

git checkout main
git merge experiment/new-optimizer

Step 4: Working with this course repo

git clone https://ai-engineering.academy
cd ai-engineering-from-scratch

git checkout -b my-progress
# work through lessons, commit your code
git push origin my-progress

Use It

For this course, you need exactly these commands:

Command	When
`git clone`	Get the course repo
`git add` + `git commit`	Save your work
`git push`	Back it up to GitHub
`git checkout -b`	Try something without breaking main
`git log --oneline`	See what you've done

That's it. You don't need rebase, cherry-pick, or submodules for this course.

Exercises

Clone this repo, create a branch called my-progress, make a file, commit it, push it
Create a .gitignore that excludes model checkpoint files (.pt, .pth, .safetensors)
Look at the commit history of this repo with git log --oneline and read how lessons were added

Key Terms

Term	What people say	What it actually means
Commit	"Saving"	A snapshot of your entire project at a point in time
Branch	"A copy"	A pointer to a commit that moves forward as you work
Merge	"Combining code"	Taking changes from one branch and applying them to another
Remote	"The cloud"	A copy of your repo hosted somewhere else (GitHub, GitLab)