Purpose of the Reflog

Content-Addressable Storage

The Commit DAG

Compression and Deduplication

What a Ref Points To

Git's Four Object Types

What the Index Tracks

Commit Parent Pointers

Objects Are Immutable

Lightweight vs Annotated Tags

Packed vs Unpacked Refs

Detached HEAD State

Loose Objects vs Packfiles

What Blobs Store

Trees and Directory Structure

Plumbing vs Porcelain

Plumbing vs Porcelain Commands

Git's Object Database and Object Lookup

Data Integrity via Hash Chaining

Loose Objects vs Packed Objects

Packfiles and Object Compression

Object Deduplication and Shared Blob Storage

Inside Git's Index (Staging Area)

References and the refs/ Namespace

The DAG: Commits as a Directed Acyclic Graph

Commit Object Anatomy

How Trees Represent Directory Structure

The Reflog Mechanism

Detached HEAD State

Refs and the refs Directory

Blob Objects

Tree Objects

Parent Commits and Merge Commits Linkage

Git Config Levels (system/global/local)

Loose Objects vs Packfiles

Lightweight vs Annotated Tags

Tag Objects (Annotated Tags)

Immutability of Git Objects

The Commit Graph (DAG) Structure

Plumbing vs Porcelain Commands

The .git Directory Structure

Object Compression and Delta Storage

Commit Objects Internal Structure

The Object Database (.git/objects)

Git Object Model Overview

Content-Addressable Storage in Git

Git's Four Object Types

Inside the .git Directory