In general the easiest to set up but the hardest to make money from is Google adsense and other advertising. Easy to set up because they give you straightforward instructions, but you need a lot of traffic to make money.

That said, on one small site I got 4,000 visitors per month and made $15/mo up to more than $65/mo which is more than I make here per month, and it grows over time because you are adding content rather than earning once for each new article.

Most other options require building an email list which means being able to create forms and embed them, which we can't do here. Also here we use "following feeds" which is not quite the same (easy to miss new stuff when you follow a bunch of people).

Personally, on my blogs I use affiliate sales commissions, my own products (courses, ebooks, etc) and services. Just being able to have your own domain name makes you look more legitimate and trustworthy, in addition to being able to make some areas for members only.