Next.js 15 refines the App Router experience with better data fetching ergonomics and improved caching defaults. Start by scaffolding a project with create-next-app and opting into the App Router directory structure.
Co-locate server actions and route handlers to keep API code close to UI. Use the new fetch cache options (`force-cache`, `no-store`, or `revalidate`) to balance freshness and performance.
For styling, Tailwind remains a fast path to consistent UI. Combine it with Radix primitives and shadcn/ui to keep accessibility concerns handled from day one.