I second checking out the PlebDev course. It's going to be good to get started with a bitcoin focus. If you want to refresh your knowledge and learn more on React I'd highly recommend https://www.udemy.com/course/the-complete-web-developer-zero-to-mastery/ on Udemy too.
You could expand that HTML and JavaScript knowledge into React knowledge, IMO, and help do front end work on apps for Nostr and Bitcoin. Udemy has several courses on React. Bitcoin itself is written in C++. Udemy again is good resource.
For React you could take the PlebDev course to get started. It's very basic, but good fundamentals. https://www.udemy.com/course/pleblabaustin/
Discussion
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