Next.js offers two forms of pre-rendering: Static Generation (SG) and Server-side Rendering (SSR). SG generates HTML at build time, resulting in fast and cacheable pages. SSR generates HTML on each request, allowing for dynamic and personalized content. Choosing between the two depends on your project's requirements.

Server Actions are asynchronous functions that are executed on the server. They can be used in Server and Client Components to handle form submissions and data mutations in Next.js applications.

Static Generation (SG) is ideal for content that can be pre-rendered at build time, resulting in fast and efficient loading. Server-side Rendering (SSR) is suited for dynamic content that needs to be fetched at runtime. Choosing between SG and SSR depends on the specific needs of your application.