Next.js offers several little-known tips to save time on development projects, including redirects and rewrites for URL manipulation, preview mode for draft content, hooking into the build process, using Preact for performance optimization, absolute imports and module path aliases for readability, CRUD API routes for building RESTful APIs, setting response HTTP caching headers, shared component attributes for page-wide state management, and mobile app development with Ionic's CapacitorJS. These tips can help developers streamline their workflow, improve performance, and create more scalable applications.