[rozenmd]

Depends on what you mean by "tech" - I have two:

https://maxrozen.com, where I write about React, and sell an extremely condensed book on a single function that few understand (useEffect), I use Gumroad for this.

https://onlineornot.com/articles, where I write about common issues webmasters have and ways to improve your team's incident management, and sell a SaaS product (via Stripe).

In both cases, I have a newsletter that folks sign up to, and I slowly convince folks that I know what I'm talking about by sending them my articles, and eventually pitch for a sale. Folks that don't like this approach opt-out by unsubscribing, and the newsletter gets stronger for it.

You could look at other payment providers - no reason to pick the ones I used.