How do you build a simple beautiful website like this?
(Not that it's a bad website, it's the most common format in the academia, just an example of a plain HTML website)
Butterick’s typography stuff and tufte will carry you through, and then just steal some more specific detailing from sites like this, gwern, xxyxyz etc
I compiled a list of such sites I was planning to steal details from for my own blog, but never actually followed through on, if you care: https://github.com/setr/pollen-site/