SSR, SSG and CSR — how do they differ and when do you choose each?

SSR: the HTML is produced on the server per request. Useful for content that depends on the current user or request.

SSG: the page is prepared ahead of time, usually at build, and can be served quickly from a cache/CDN. Example: documentation.

CSR: the browser runs JavaScript and builds or updates the view. Example: an interactive dashboard after login.

To be precise: these techniques can be combined. Rendering the initial view on the server doesn't rule out later client-side interactions and navigation.

Practical note: I justify the choice by data freshness, personalisation, SEO and load time, not by the technology's name.