In January, I started giving free IP advice in various forums like Reddit, Indiehackers, and some other communities. I also started marketing with Google Ads (~$36/day) and FB Ads (~$7/day).
The first customers came from Google Ads. I am still not profitable because it cost ~$500 in ads money and generated ~$400 in revenue, but I'm going to spend time talking to the customers to learn why they paid for my course.