These online courses are so great and so cheap for the value you're getting..... but they require so much more disicpline than more traditional education. Your approach of taking time to consolidate your learnings is huge, and something people don't spend enough time with. I actually really like the Treehouse education platform, but Udemy seems right up there too.
You're absolutely right. .. developing against the blockchain will be absolutely huge over the next decade. Well done on investing the time now.