I came across the easiest one-page website and most simple idea for traffic I've ever seen (https://timesless.com/). The page is simply an explanation for a google question about when to say "Times less than" in the English language. It's basically a standalone Quora answer that stands on the top of search rankings and likely drives traffic to the owners Amazon book about English grammar.
Just a cool reminder that web businesses don't have to be super complicated to make money. They just have to provide the right amount of value for your users!