What React Developer Should Know? 37 Key Points

What React Developer Should Know? The 37 Most Essential Things React Developers Should Learn and Know in 2023

React continues to be one of the most in-demand, versatile frontend frameworks in web development. Mastering React is crucial for succeeding as a modern web developer.

But with so much to learn across React core, state management, styling, testing, performance and more – what should you focus on first?

As an experienced React developer, I want to share the 37 most essential things every React dev should know and learn in 2023.

These core concepts, tools and best practices will give you a robust foundation for building high-quality React applications that scale.

Let’s dive in:

React Core

  1. JSX Syntax – The XML-like syntax for describing React component UIs and rendering them to the DOM.
  2. Creating Components – Building reusable, composable components containing markup, styles and logic.
  3. Props vs State – Props pass data into components while state is managed within the component.
  4. Hooks – UseState, useEffect, useContext and more for managing state and side effects.
  5. Handling Events – Binding event handlers and passing data via events.
  6. Conditional Rendering – Rendering UI conditionally based on component props or state.
  7. Managing Updates – Properly batching state updates and re-renders with useState and useReducer.

Advanced React Concepts

  1. React Context API – Global state management with the Context API.
  2. React Router – Client-side routing and navigation between views.
  3. React Suspense and Lazy Loading – Code splitting components to optimize performance.
  4. React Hooks Patterns – Custom hooks for abstracting logic.
  5. React Animation Libraries – Animate UIs with Framer Motion, React Spring etc.
  6. Server Side Rendering w/ Next.js – Universal React apps for SEO and performance.
  7. React Design Patterns – Compound components, higher order components and more.

State Management

  1. Redux – Centralized app state management with actions, reducers and the store.
  2. React Query – Handles asynchronous data fetching and caching.
  3. Redux Saga – Async middleware for handling complex side effects.
  4. MobX – Simple reactive state management using observables.


  1. Styled Components – Scoped CSS with unique class names for React components.
  2. CSS Modules – Locally scoped CSS using unique class names.
  3. SASS/SCSS – Superset of CSS adding variables, nesting and more.
  4. CSS-in-JS – Defining component styles in JS objects.


  1. Jest – The default React testing framework.
  2. React Testing Library – Lightweight utilities for testing component output.
  3. Mocking Libraries – Mock data dependencies like API responses.
  4. Unit vs Integration Testing – Testing units in isolation vs as a group.
  5. Snapshot Testing – Capture component rendered output for regression testing.
  6. Test Pyramid – Higher ratio of unit to integration/e2e tests.


  1. React.memo – Wrap functional components to avoid unnecessary re-renders.
  2. useMemo/useCallback – Cache expensive functions to avoid duplicate calls.
  3. Virtualization – Only render visible items e.g. react-window.
  4. Bundle Splitting – Split bundles to only load necessary code.
  5. Lazy Loading – Dynamically load non-essential components/data.


  1. Semantic HTML – Use correct heading tags, alt text, aria labels etc.
  2. react-aria – Provides hooks for accessible UIs.
  3. Keyboard Navigation – Ensure components can be fully used via keyboard.
  4. Color Contrast – Meet minimum color contrast ratios for text readability.

Building competency across these 37 concepts will give you an incredibly solid, well-rounded foundation as a React developer in 2023.

You’ll be able to build high-quality, robust React apps following best practices around:

  • Maintainable, reusable components
  • Managing complex state
  • Flexible, scalable styling
  • Accessible, semantic markup
  • Optimized performance
  • Reliable tests

While this list covers the most essential things, the learning never stops.

Here are some next steps after mastering these core foundations:

  • Contribute to open source React projects
  • Write custom React hooks reusable across apps
  • Build full stack apps with Node and MongoDB
  • Animate complex UI interactions
  • Experiment with React Native for mobile development
  • Architect large scale React codebases
  • Gain deep expertise with state management like Redux

As React continues to evolve, stay up to date by:

  • Reading release notes for new features
  • Attending React conferences and meetups
  • Building apps with the latest technologies like React 18’s automatic batching
  • Learning TypeScript for superior type safety

With a curiosity for continuously improving and a focus on writing clean, well-tested components – you’ll go far in your React career.

These 37 fundamentals are your guide to getting started on the right foot.

So dive in, build real-world apps, and become the React expert that companies seek out. The demand isn’t going away anytime soon – so secure your React skills today!

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