This article was originally published on AI Study Room . For the full version with working code examples and related articles, visit the original post. React Hooks Complete Guide 2026: From useState to useOptimistic React Hooks have been the primary way to add state and logic to React components since 2019, but their surface area keeps growing. React 19 and React 20 (2026) introduced hooks like useOptimistic and useFormStatus that change how we handle optimistic updates and form state. This guide covers every built-in React hook, when to use each, and the most common pitfalls.…