I don't have any personal experience w this but have been thinking about doing similar things myself. I recently listened to a podcast on Indie Hackers with Nat Eliason, who has monetized his SEO knowledge quite effectively [0]
He wrote a few blog posts that went viral, for some he did affiliate stuff, for others he actually built apps that he sold through the article and apparently made $3-7K / month from that in a nearly entirely passive manner.
He also monetized his knowledge on SEO by starting a growth agency that does SEO for clients and apparently makes $85K / month for that after just like 8 months of working on it
If you can turn your knowledge into an app or plugin (solve the problem for them instead of tell them how to), or an e-book, and sell them for $20-50+, that might be more profitable than ads or affiliate stuff, as long as you convert at a high enough rate
He also writes and publishes notes on all books he reads, and he sells an evernote notebook with notes on like 200 books for $50 or so. He does a lot of other clever monetization stuff. Of course his advantage is that he has a personal blog that gets a lot of organic traffic, and lots of SEO knowledge, so distribution is easy for him
Another person, Nathan Barry, wrote e-books on how to write apps, how to write etc and made 5-6 figures from those. That then evolved into a bootstrapped startup that currently does $1.2M rev / mo [1]
Both of them are good marketers and their product / monetization flows from that.
[0] https://www.indiehackers.com/podcast/065-nat-eliason-of-grow...
[1] https://nathanbarry.com/2018-review/
