Next.js Best Practices Principles for Next.js App Router development. --- 1. Server vs Client Components Decision Tree By Default | Type | Use | |------|-----| | Server | Data fetching, layout, static content | | Client | Forms, buttons, interactive UI | --- 2. Data Fetching Patterns Fetch Strategy | Pattern | Use | |---------|-----| | Default | Static (cached at build) | | Revalidate | ISR (time-based refresh) | | No-store | Dynamic (every request) | Data Flow | Source | Pattern | |--------|---------| | Database | Server Component fetch | | API | fetch with caching | | User input | Client st…