A static site generator and github pages (that way Microsoft foots the bill!)

If that’s too complicated, you can join a writefreely federated instance, like https://write.as, or self-host your own.

And if that’s too complicated, just use something like Medium (although I think they started adding paywalls to blogs)

Personally, I use a SSG (https://github.com/getzola/zola) + GitHub pages.