Website with programming courses, for a small income

I am currently building a website with programming courses. I will be doing courses on Python and HTML+CSS+JS, as I develop I will add more courses. The cost of the course will be around 50$ to 350$. The course will consist of theory and task (or only theory or task) with a user friendly dashboard (example with python on the screenshot). I am going to promote the site through google ads, tiktok, youtube and other social media.

Do you think this is a good idea for a small income?
Do you have any ideas where else to promote such a site?

scrape github/gitlab etc to find email and mailing them your site

I think you need to adjust your pricing, the cheaper you make it, the more you can attract customers.