How to create a simple website with text in the middle and chapters on the left side?

I've been looking into how to create websites/blogs or how to have them hosted, but I always find super-long guides, while I already have a model of what I'm looking for:

https://read.easypeasymethod.org/

I'm talking purely about format here, not the content.

I can't find any info on a hoster, or how they did it. Does anyone has an easy explanation for how to do a copy of this in form, just with different text?