What are the three main rendering strategies available in Next.js, and what does each one mean?

Server side rendering, called SSR, generates the page fresh on every request. Static site generation, called SSG, generates the page once at build time and reuses it for every visitor. Incremental static regeneration, called ISR, generates a page once but automatically refreshes it after a set amount of time, combining the speed of static pages with reasonably fresh content.

// SSG: fetched once at build time
// SSR: fetched fresh on every request
// ISR: fetched once, then refreshed periodically
const res = await fetch(url, { next: { revalidate: 3600 } });