Amazing new Skill from Claude Code team - playground

Come with with six templates built in:
- Code Map
- Concept Map
- Data Explorer
- Design Playground
- Diff Review
- Document Critique

Here it's created a fully interactive architecture overview of the…

Master the command line with Effective Shell - a free online book for developers and power users

Writing a sqlite clone from scratch in C

A collection of principles and patterns that shape software systems, teams, and decisions.

A project-based course on designing the environments, state, verification, and control systems that make Codex and Claude Code reliable.