CheatGrid

About CheatGrid

CheatGrid is a study reference site for technical and professional topics, organized into categories such as web development, cloud infrastructure, cybersecurity, data and databases, and professional skills. Each topic page presents a cheat sheet broken into tables covering specific concepts, alongside linked practice tests and spaced-repetition flashcard decks for the same subject matter.

The React Frontend Framework Cheat Sheet page covers React as a component-based JavaScript library maintained by Meta, describing its virtual DOM and Fiber reconciliation engine. It documents React 19 features including the action-based async model, Server Components, and hooks such as useActionState, useFormStatus, and useOptimistic, as well as the React Compiler for automatic memoization. The page organizes 200 entries across 21 tables spanning core hooks, component fundamentals, JSX and rendering, state management, effects and lifecycle, performance optimization, component patterns, event handling, forms and validation, refs and DOM access, context, error handling, routing, testing, TypeScript integration, advanced features, styling approaches, devtools, build tools, state management libraries, and accessibility practices, plus an interactive mind map linking concepts to table rows.

The site tracks user progress through a leveling/XP system and includes a practice test feature (7 tests, 241 questions for the React topic) and flashcard decks (150 cards for React) using spaced repetition. It is organized around a broad set of categories including AI/ML, generative AI, cloud computing, DevOps, business intelligence, data engineering, databases, project management, backend/mobile development, programming languages, cybersecurity, networking, mathematics, operating systems, and certifications.

Key features

• Interactive cheat sheets covering programming, cloud, data, and other technical topics
• Practice tests tied to specific topics (e.g. 241 questions across 7 tests for React)
• Intelligent Flashcards using spaced repetition to reinforce topics
• Certification-focused content categories alongside general topic categories
• Mind map view linking concepts to their table rows within a cheat sheet