Why not, knowledge is the best investment that you can make for yourself. If you are looking for learning how crypto currency works, that is a great option. Take in consideration that people are always looking for ways to make some easy cash so I assume that part of the courses out there are some stupid things that will do you no good. I am always for the solo research as well because it is a good sign that you will learn more if you put and extra effort into it. Plus, as someone said, block chain is a technology of the future, so it will probably do you good even if BTC dies