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Git Mastery: From First Commit to Expert

The Complete Practical Guide — Fundamentals, Workflows, Internals, and Real-World Problem Solving

This book is 100% completeLast updated on 2026-07-13
+5,463 words in the last 30 days

Stop memorizing Git commands and learn how Git actually works. Git Mastery: From First Commit to Expert covers everything from version control basics to advanced workflows, debugging and Git internals with practical examples that help you collaborate with confidence and solve Git problems on your own.

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About the Book

This book takes you from your very first `git init` to the deepest corners of Git's internals. You will learn not just what commands to run, but why they work the way they do. Through practical scenarios, step-by-step examples, hands-on exercises with solutions, and real-world troubleshooting, you will develop the deep understanding that separates a confident developer from one who is always Googling error messages. Whether you are preparing for technical interviews, managing a team's workflow, or simply tired of losing work to `git reset --hard`, this guide gives you the tools and mental model to master Git once and for all.

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About the Author

Steve Publications

Steve is a technology professional with more than 20 years of experience in software development, server infrastructure, cybersecurity, vulnerability research and reverse engineering. Throughout his career, he has designed, secured, analyzed and tested complex software and infrastructure, with a particular focus on understanding how systems fail and how they can be made more secure.

Outside of work, Steve enjoys sharing knowledge with the technology community. He collaborates with researchers, industry experts and technology professionals to write practical books covering software development, cybersecurity, cloud computing, networking, DevOps, artificial intelligence and enterprise technologies. His books focus on practical learning through clear explanations, real-world examples and hands-on exercises. With more than two decades of industry experience, his goal is to help IT professionals, students and technology enthusiasts build useful skills and stay current in a rapidly changing industry.

We believe readers deserve to know how our books are created. Most of our authors are not native English speakers, so we use AI to help translate, proofread manuscripts, fix grammar, improve sentence structure and make technical explanations easier to read. AI is used as an editing tool only. It does not replace the research, technical knowledge or hands-on experience behind our books. Some of our authors also prefer to remain anonymous for privacy or professional reasons. In those cases, we publish their work under a different name. The author's name may be different, but the quality of the content and our review process remain the same.

Every book is written, reviewed and maintained by experienced technology professionals, with contributions from our private technical community of more than 400 engineers and researchers from Ukraine, Belarus and Russia. We spend far more time validating technical accuracy and keeping our content up to date than generating text. We are always interested in working with experienced professionals who have deep expertise in a particular technology or domain. If you would like to publish a book with us or help review an existing manuscript, we'd love to hear from you. Send us a message describing your area of expertise. We are especially interested in niche technologies, specialized skills and emerging topics that are underrepresented in existing technical literature.

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Contents

Table of Contents

The Complete Practical Guide: Fundamentals, Workflows, Internals, and Real-World Problem Solving

Introduction

Chapter 1: The Git Mental Model

  1. The Version Control Landscape
  2. The Directed Acyclic Graph
  3. The Three-Tree Model
  4. Object Types: Blob, Tree, Commit, Tag
  5. References: Branches, Tags, and HEAD

Chapter 2: Installation and Configuration

  1. Installing Git
  2. The Config Layers: System, Global, Local
  3. Identity and Email
  4. Authentication: SSH vs HTTPS
  5. Essential Settings

Chapter 3: Your First Repository

  1. Initializing a Repository
  2. The Add/Commit Cycle
  3. Viewing History
  4. Undoing Mistakes
  5. Hands-On Exercise: Build a Tiny Project

Chapter 4: Commits and History Management

  1. Commit Anatomy
  2. Amending and Rewriting
  3. Interactive Rebase Deep Dive
  4. Cherry-Pick: Applying Individual Commits
  5. Commit Messages That Matter
  6. Hands-On Exercise: Amend and Rewrite a Commit

Chapter 5: Branching and Merging

  1. Creating and Switching Branches
  2. Merge Strategies: Fast-Forward vs Recursive vs Octopus
  3. Merge Conflicts: What Causes Them and How to Resolve
  4. Three-Way Merge Explained
  5. Hands-On Exercise: Simulate a Real Merge Conflict

Chapter 6: Rebasing and Linear History

  1. Why Rebase? Clean History vs Merge Commits
  2. Interactive Rebase in Practice
  3. Rebase Conflicts: How They Differ from Merge Conflicts
  4. Walkthrough: Resolving a Rebase Conflict Step by Step
  5. Hands-On Exercise: Clean Up a Messy History
  6. The Great Debate: Rebase vs Merge
  7. Hands-On Exercise: Rebase a Feature Branch

Chapter 7: Remotes and Collaboration

  1. Remote Mechanics: Fetch, Pull, Push
  2. Tracking Branches and Upstream/Downstream
  3. The Push/Pull Cycle
  4. Force Push Dangers
  5. Pull Requests and Code Review
  6. Hands-On Exercise: Fork, Clone, Branch, Commit, Push, and PR

Chapter 8: Advanced Branching Workflows

  1. Git Flow: The Classic Model
  2. Trunk-Based Development: The Modern Approach
  3. Feature Flags and Deployment
  4. Monorepos: Managing Multiple Projects in One Repo
  5. Choosing a Strategy

Chapter 9: Stashing, Tagging, and Cleanup

  1. Stash Mechanics: Saving Changes Without Committing
  2. Patch Stashes: Stashing Selective Changes
  3. Tags: Lightweight vs Annotated
  4. Cleanup Commands
  5. Hands-On Exercise: Stash, Work on Another Branch, Apply

Chapter 10: Git Hooks and Automation

  1. Hook Types: Pre-Commit, Pre-Push, Commit-Message
  2. Writing Your First Hook
  3. Hook Templates: Sharing Hooks Across Repos
  4. CI/CD Integration
  5. Hands-On Exercise: Create a Pre-Commit Hook

Chapter 11: Submodules and Worktrees

  1. Submodule Mechanics: Add, Update, Clone
  2. Common Submodule Pitfalls
  3. Git Worktrees: The Modern Alternative
  4. When to Use Which
  5. Hands-On Exercise: Set Up a Repo with a Submodule and a Worktree

Chapter 12: Git Internals

  1. The Object Store: Blob, Tree, Commit, Tag in .git/objects
  2. SHA-1 and Content Addressing
  3. Packfiles and Compression
  4. The Reflog: Where Deleted Branches Go
  5. How git log Works Under the Hood
  6. Hands-On Exercise: Explore the Object Store with git cat-file

Chapter 13: Performance and Scale

  1. Large Repositories: What “Large” Means and Common Bottlenecks
  2. Shallow Clones: --depth and Trade-Offs
  3. Sparse Checkout: Checking Out Only What You Need
  4. Partial Clones: Skipping Large Blobs
  5. Bisection for Debugging: Finding Regressions Fast
  6. Performance Tuning: git config Options
  7. Hands-On Exercise: Use git bisect to Find a Regression

Chapter 14: Security and Best Practices

  1. Signed Commits: GPG and SSH Signing
  2. Secrets in History: Removal and Prevention
  3. Audit Trails and Compliance
  4. Security Scanning: Pre-Commit and CI Integration
  5. Hands-On Exercise: Remove a Committed Secret

Chapter 15: Troubleshooting and Recovery

  1. Lost Commits: The Reflog as Your Safety Net
  2. Corrupted Repositories: git fsck and Repair
  3. Common Error Patterns: Causes and Fixes
  4. Recovery Scenarios: Step-by-Step Procedures
  5. Hands-On Exercise: Simulate a Corrupted Repo and Recover

Conclusion: The Expert’s Mindset

References

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