Cheat sheetsfor every layer of the web stack

Quick, accurate answers for the languages, frameworks, and tools you use every day — each sheet verified against primary sources, and typeset for reading on your Kindle.

Browse by section

• Foundations5 sheets

  Concepts that come before any language or framework.

  API ConceptsIoT ConceptsMicroservices architectureQueuing systemsThe Lean Startup
• Languages7 sheets

  Syntax and type systems, standalone of any runtime or framework.

  C#JavaScriptMarkdownPythonRustSQLTypeScript
• Frontend8 sheets

  Browser runtime, UI frameworks, styling, and markup.

  AngularNext.js AdvancedNext.js BasicReact AdvancedReact BasicReduxTailwind CSSZustand
• Backend8 sheets

  Server runtime, API design, auth, and messaging.

  .NET CoreApollo GraphQLEntity Framework CoreExpress.jsGraphQLMQTTNode.jsREST API
• Data1 sheet

  Datastores, query languages, and data modeling.

  PostgreSQL
• Tooling3 sheets

  Developer-machine tools you reach for every day.

  Claude Code CommandsGitGitHub Actions
• Practices2 sheets

  Cross-cutting engineering discipline.

  OWASP Top 10Scrum

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Every sheet is typeset for e-ink in two sizes — Paperwhite and Scribe. Not a shrunken A4 PDF: real margins, grayscale-safe code highlighting, and type sized for a 300ppi panel.

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TypeScript

as const	literal, readonly
satisfies T	check, keep type
keyof T	union of keys