How to manage state in modern frontend applications: a practical guide Frontend state management tutorial: a practical guide across local, server, URL, and app state with concrete patterns and code. What to manage where Local UI state: useState, useReducer, or component-level hooks for transient UI like form inputs, toggles, modals. Server data state: fetchable data from APIs that needs caching, invalidation, and background refresh. URL state: values encoded in the URL (query params) to enable shareable/bookmarkable state. App/global state: cross-cutting state shared across many components, like authentication, theme, or user preferences. Persisted client state: state that should survive page reloads, e.g., user preferences saved to localStorage. Patterns and when to use them Context API When to use: simple global state that doesn’t need complex logic or heavy updates; you want to avoid prop drilling without adding a full library. Pros: built-in to React, minimal setup, good for lightweight sharing.…