I created a series to help me learn about systems. I didn't tell anyone I knew I was working on this and just posted on HN (thanks for the support!) that first year. I put a paid option that I hid on a secondary page. Revenue is very small (in the hundreds) but soon I'll focus on building it into a business. Now that I talk about it with people, around 90% have encouraged me to monetize, but I am figuring out how. https://unintendedconsequenc.es/