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overview (20)

Claude API

The Anthropic Claude API — Python and TypeScript SDKs, streaming, tool use, batches, prompt caching, files, vision, and agentic loops.
claude anthropic api python typescript tool-use streaming batch caching files

Claude Code

Anthropic's agentic CLI — installation, configuration, slash commands, hooks, MCP integration, subagents, skills, statusline, and power-user workflows.
claude-code cli anthropic agentic

Packages

Cheat sheets for individual libraries and modules across language ecosystems — pip, npm, Cargo, and Go.
packages libraries ecosystem pip npm cargo go

Cargo Crates

Cheat sheets for Rust crates from crates.io — async runtimes, serialization, CLI builders, HTTP clients, and more.
packages cargo rust crates libraries

Go Modules

Cheat sheets for Go modules from pkg.go.dev — web frameworks, CLI builders, config, ORMs, and more.
packages go modules libraries

npm Packages

Cheat sheets for Node.js modules from the npm registry — HTTP clients, validation, CLI builders, utility libraries, and more.
packages npm node javascript libraries

Pip Packages

Cheat sheets for third-party PyPI packages — HTTP clients, data tools, validation, terminal UIs, and more.
packages pip python pypi libraries

Prompting

Prompt engineering patterns, RAG, evaluations, few-shot, chain-of-thought, and structured output — foundational techniques for extracting reliable, structured behavior from LLMs.
prompting rag llm prompt-engineering cot few-shot evals structured-output

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.
python packages pip overview

AI

Claude Code, Codex CLI, the Claude API, and prompt engineering — practical reference for building with and using large language models.
ai llm claude prompting anthropic codex openai

Codex CLI

OpenAI's open-source agentic coding CLI — installation, config.toml, slash commands, sandboxing, MCP integration, and AGENTS.md workflows.
codex openai cli agentic coding-agent

Operating Systems

Command-line references and tooling guides for Linux, Windows, z/OS, and macOS.
os linux windows zos macos overview

JavaScript

Node.js runtime, package managers, async patterns, array methods, and frontend tooling — a complete JavaScript reference for the command line and the browser.
javascript node npm cli

Programming

A reference hub for programming languages and their ecosystems — Python, JavaScript, and TypeScript, with package managers, runtimes, and tooling.
programming python javascript typescript overview

TypeScript

Static typing for JavaScript — tsconfig reference, the full type system, generics, utility types, narrowing, and common compiler errors explained.
typescript javascript types

Python

Installation guides, essential packages, CLI snippets, and real-world recipes for Python 3.
python overview

macOS

Command-line tools, system utilities, Homebrew, Finder tricks, and macOS-specific development workflows.
macos osx terminal shell cli

Linux

Command-line tools, shell scripting, networking, system administration, and data extraction for Linux.
linux shell sysadmin

Windows

PowerShell, winget, WSL interop, yt-dlp, beets, and Windows administration.
windows powershell cli

z/OS

JCL, TSO/ISPF, REXX, and IBM mainframe system administration.
zos mainframe ibm jcl