I second Hugo. It's been my SSG of choice for a long time, and once you understand where to put things, it really lives up to its name.

The fact that it's in Go, and therefore distributed as a single binary, also makes installation and use anywhere you want it a cakewalk. YMMV on how important that is to you, but I like to keep my tools light and nomadic when possible.

I use Hugo, GitHub to store blog and Cloudflare Pages to host it. This setup is free, straightforward and configures in few clicks. You only need to pay for the domain name.