I can strongly recommend https://thebootstrappedfounder.com/

There's also a Podcast, Newsletter and the creator is active on Twitter and responds to questions.

In short:

- packed with first-hand experience

- easy to follow

- instantly useful

- the best advice for making something with actually returns money: find and solve a "critical" problem. Learn how to look & find them.

Start small while listening to it.

Also, I've found "This is Marketing: You Can’t Be Seen Until You Learn To See" by Seth Godin to be really helpful. It changed my mind quite a bit around the topic of marketing (Ads != Marketing; love the concept of "find the Minimum Viable Audience").