Modern frontend development with React and Next.js aims to build fast, maintainable, accessible web apps in 2025. State management is crucial, but you may not need a library like Redux or Zustand if you manage states granularly using React's `useState` and `useContext`. Hybrid rendering combines different strategies for different purposes, such as Server-Side Rendering (SSR), Static Site Generation (SSG), Client-Side Rendering (CSR), and Incremental Static Regeneration (ISR). Performance optimization is key, with techniques like avoiding premature optimization, using Core Web Vitals, memoizing components, and implementing progressive enhancement. Code maintainability can be achieved through documentation, component structure, testing, and accessibility best practices. By following these modern best practices, developers can build fast, maintainable, accessible web apps that provide a great user experience.