Every link you need to become a builder in 30 days (bookmark this):
Agent Architecture https://langchain.com/blog?category_equal=%5B%22Agent+Architecture%22%5D
Claude Code 101: https://anthropic.skilljar.com/claude-code-101
Claude Code in Action: https://anthropic.skilljar.com/claude-code-in-action
Prompt engineering (official): https://platform.claude.com/docs/en/build-with-claude/prompt-engineering/overview
Interactive prompt tutorial (hands-on): https://github.com/anthropics/prompt-eng-interactive-tutorial
CLAUDE.md & how to give Claude memory: https://code.claude.com/docs/en/claude-md
Skills, teach Claude reusable workflows: https://code.claude.com/docs/en/skills
MCP, time connect Claude to Slack, GitHub, Drive: https://code.claude.com/docs/en/mcp
Routines (automate tasks 24/7): https://code.claude.com/docs/en/routines
Claude Code Ultimate Guide (community): https://github.com/FlorianBruniaux/claude-code-ultimate-guide
Awesome Claude Code (skills, hooks, plugins): https://github.com/hesreallyhim/awesome-claude-code
All 13 Anthropic Academy courses (free certs): https://anthropic.skilljar.com
Claude Code full docs: https://code.claude.com/docs/en/overview
All of these sources are free.