overview
20 pages in this category.
Prompting
Prompt engineering patterns, RAG, evaluations, few-shot, chain-of-thought, and structured output — foundational techniques for extracting reliable, structured behavior from LLMs.
Pip Packages
Cheat sheets for third-party PyPI packages — HTTP clients, data tools, validation, terminal UIs, and more.
Packages
Cheat sheets for individual libraries and modules across language ecosystems — pip, npm, Cargo, and Go.
npm Packages
Cheat sheets for Node.js modules from the npm registry — HTTP clients, validation, CLI builders, utility libraries, and more.
Go Modules
Cheat sheets for Go modules from pkg.go.dev — web frameworks, CLI builders, config, ORMs, and more.
Essential Python Packages
Overview of the 34 most useful Python packages — HTTP clients, data science, web frameworks, orchestration, testing, and tooling. Each has its own dedicated page with examples.
Claude Code
Anthropic's agentic CLI — installation, configuration, slash commands, hooks, MCP integration, subagents, skills, statusline, and power-user workflows.
Claude API
The Anthropic Claude API — Python and TypeScript SDKs, streaming, tool use, batches, prompt caching, files, vision, and agentic loops.
Cargo Crates
Cheat sheets for Rust crates from crates.io — async runtimes, serialization, CLI builders, HTTP clients, and more.
Operating Systems
Command-line references and tooling guides for Linux, Windows, z/OS, and macOS.
Codex CLI
OpenAI's open-source agentic coding CLI — installation, config.toml, slash commands, sandboxing, MCP integration, and AGENTS.md workflows.
AI
Claude Code, Codex CLI, the Claude API, and prompt engineering — practical reference for building with and using large language models.
TypeScript
Static typing for JavaScript — tsconfig reference, the full type system, generics, utility types, narrowing, and common compiler errors explained.
Programming
A reference hub for programming languages and their ecosystems — Python, JavaScript, and TypeScript, with package managers, runtimes, and tooling.
JavaScript
Node.js runtime, package managers, async patterns, array methods, and frontend tooling — a complete JavaScript reference for the command line and the browser.
Python
Installation guides, essential packages, CLI snippets, and real-world recipes for Python 3.
macOS
Command-line tools, system utilities, Homebrew, Finder tricks, and macOS-specific development workflows.
z/OS
JCL, TSO/ISPF, REXX, and IBM mainframe system administration.
Windows
PowerShell, winget, WSL interop, yt-dlp, beets, and Windows administration.
Linux
Command-line tools, shell scripting, networking, system administration, and data extraction for Linux.