Most people learn Git like this:

✅ git add
✅ git commit
✅ git push

But many developers still feel confused because they don’t understand what Git actually does inside.

So in this blog, we’ll build a strong mental model of Git internals — in the simplest way possible.

✅ What Git Really Is (Not Just Commands)

Git is basically a database that stores your project history.

But it stores data in a very smart way:

✅ It stores snapshots (not normal file copies)
✅ It stores everything using hash IDs
✅ It connects files, folders, and commits like a chain

📁 The .git Folder: The Brain of Your Repository

→When you run:

git init

→Git creates a hidden folder:

.git/

This folder stores everything Git needs:

✅ commit history
✅ branches
✅ staging data
✅ objects (files + folders + commits)

If you delete .git → your project becomes a normal folder again (no Git).

🗂️ Important Parts Inside .git

Here’s the most useful structure to remember:

.git/
 ├── objects/
 ├── refs/
 ├── HEAD
 ├── index
 └── config

→Meaning in simple words

✅ objects/ → Git stores all data here (like files + commits)
✅ refs/ → branches & tags pointers
✅ HEAD → tells which branch you’re currently on
✅ index → staging area file
✅ config → repository settings

Git Stores Everything as “Objects”

Git has 3 main objects:

1. Blob

2. Tree

3. Commit

These 3 things are enough to store a complete project history.

1) Blob Object = File Content

→A Blob stores:

✅ only file content
❌ not the file name

Example:
If your file hello.txt contains:

Hello Git

Git creates a blob for that content.

If another file has the same content, Git doesn’t store it again.

✅ Saves memory
✅ Super efficient

2) Tree Object = Folder Structure

→A Tree stores:

✅ file names
✅ permissions
✅ link to blobs and other trees

Think of it like a folder map:

project/
 ├── index.html → blob
 ├── style.css  → blob
 └── src/       → tree

So tree is like directory structure.

3) Commit Object = Full Snapshot of Your Project

A commit stores:

✅ reference to a tree
✅ message
✅ author
✅ date/time
✅ parent commit (previous snapshot)

Important:

Commit does NOT store files directly
It points to a tree, and tree points to blobs

Best Mental Model: Commit → Tree → Blob

Commit
  ↓
Tree (folder structure)
  ↓
Blob (file content)

# How Git Tracks Changes (The Truth)

Many beginners think:

❌ Git stores changes line-by-line
✅ Git stores snapshots

Every commit is a full snapshot, but Git is smart:

• unchanged files reuse old blobs

• only new file content becomes new blobs

That’s why Git is fast even with many commits.

# What Happens Internally When You Run git add

Command:

git add .

Git does this internally 👇

✅ Reads your changed file content
✅ Converts each file into a blob object
✅ Stores blobs inside:

.git/objects/

✅ Updates the index (staging area)

✅ Simple meaning:

git add = “Save changes to staging, ready to commit”

# What Happens Internally When You Run git commit

Command:

git commit -m "done"

Git does this internally 👇

✅ Takes staged blobs from index
✅ Creates a tree object (snapshot structure)
✅ Creates a commit object (with metadata)
✅ Moves HEAD to latest commit

✅ Simple meaning:

git commit = “Save snapshot permanently to history”

# Git Uses Hashes for Safety (Why It’s Reliable)

Git names every object using a hash like:

e83c5163316f89bfbde7d9ab23ca2e25604af290

This hash comes from:

✅ file content + object type + metadata

If you change even one character, the hash changes completely.

That’s why Git is secure because:

✅ No silent modification
✅ Integrity is guaranteed
✅ History is trustworthy

#Git Workflow (The Perfect Mental Model)

Think of Git as 3 areas:

Working Directory → Staging Area → Repository
     (edit)           (add)           (commit)

Example:

✅ Edit file → Working directory
✅ Add file → Stage it
✅ Commit → Save snapshot

This model will help you forever. No memorization needed.

✅ Final Conclusion

Git is not magic.

It is just a smart system that stores:

✅ file content as blobs
✅ folder structure as trees
✅ snapshots as commits
✅ everything linked by hashes

That’s why Git is:

🔥 Fast
🔥 Reliable
🔥 Perfect for collaboration
🔥 Industry mandatory

The End