React

React as it is actually used in 2026: server data, composition and disciplined state.

1. Step 01

   Fundamentals

   JSX, props, lists, conditional rendering and controlled inputs.

   ReactJSX

2. Step 02

   State & effects

   useState, useReducer, when effects are wrong, and deriving instead of syncing.

   Hooks

3. Step 03

   Data fetching

   Server state with TanStack Query, caching, mutations and optimistic updates.

   TanStack Query

4. Step 04

   Routing

   Nested routes, loaders, pending and error states, code splitting.

   TanStack Router

5. Step 05

   Performance

   Memoisation that pays off, list virtualisation and profiling renders.

   ProfilerVirtualisation

6. Step 06

   Patterns

   Compound components, headless UI, forms with validation and design-system integration.

   FormsRadix