After 15 minutes of googling, I believe you'll have a good grasp on that stuff. I've been there.
So there is new stuff you need to know. On the other hand, these days you'll find that blog post that walks you through installing nginx and certbot on your $5/month VPS, prepackaged with dependencies, just works out of the box, in a very short order. From what I recall from the late 90s, setting up a plain old fashioned HTTP server felt a lot more difficult then.
In the late 90s you mentioned above, ISPs routinely provided some web space as part of the package, at least in my country. You just FTPed your files up to them, and they ran all the necessary software for you.
So there is new stuff you need to know. On the other hand, these days you'll find that blog post that walks you through installing nginx and certbot on your $5/month VPS, prepackaged with dependencies, just works out of the box, in a very short order. From what I recall from the late 90s, setting up a plain old fashioned HTTP server felt a lot more difficult then.