Indie hackers is definitely great for this kind of content. I'd also recommend "Startups for the rest of us" [1], "The art of product" [2], Patrick Mckenzies blog [3] and Stripe Atlas guides [4]. The first three resources all pretty much describe how to bootstrap SaaS-companies, while the Atlas guides are more general guides for businesses. Finally there's an excellent episode on Reid Hoffman's podcast "Master's of Scale" interviewing the founder of Mailchimp [5].
[1]: https://www.startupsfortherestofus.com/
[2]: https://artofproductpodcast.com/
[3]: https://www.kalzumeus.com/
[4]: https://stripe.com/atlas/guides
[5]: https://mastersofscale.com/ben-chestnut-the-case-for-bootstr...