From the source
Vercel's guide explains the use cases and tradeoffs of Static Site Generation (SSG), Incremental Static Regeneration (ISR), Server-Side Rendering (SSR), Client-Side Rendering (CSR), and experimental Partial Prerendering (PPR) for optimizing performance, SEO, and user experience.
It covers ideal use cases, benefits, and implementation considerations for each strategy, and notes that the Next.js App Router defaults to streaming SSR.






