Claude Code Full Course — From Beginner to Expert | Part 3: Slash Commands
Master slash commands in Claude Code — the control panel that turns AI from something you talk to into something you steer. In this third part of the Claude Code Full Course, you will learn the 55 plus built-in commands that every user needs, how to create custom skills that package your workflows, and the frontmatter settings that make skills discoverable and safe.
You will learn how to:
Use the nine built-in slash commands you will reach for every day: slash clear, slash compact, slash model, slash rewind, slash plan, slash effort, slash diff, slash context, and slash branch
Understand the four types of commands: built-in, skills, plugin commands, and MCP prompts
Follow the command resolution flow that decides which command runs when you type a forward slash
Create custom skills with SKILL.md files that receive arguments and inject dynamic context
Use variable substitution patterns: dollar arguments, positional parameters, dynamic shell commands, and file inclusion
Run skills in isolated context with the fork setting to protect your main conversation
Avoid six common anti-patterns that make slash commands worse than just typing naturally
Timestamps:
0:00 Recap — Part 2
0:45 Why slash commands matter
1:30 Core concepts: CLI, REPL, skills, frontmatter
2:45 Four types of commands
3:45 Command resolution flow
4:45 Built-in commands you will use every day
6:30 Variable substitution in skills
7:45 Custom skill example: database migrations
9:30 Isolated execution with context fork
10:45 Frontmatter fields that control behavior
12:15 Skills replaced legacy commands
13:00 Anti-patterns: five mistakes with commands
14:30 Four rules that make commands work
15:45 What is coming next
Claude Code slash commands are the single most practical feature for daily productivity. Once you build a library of custom skills, every session becomes faster and more reliable. This module gives you the foundation to start building yours today.
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