Seriously, don't pass up the Bitcoin stack exchange. Pretty much everything you could have ever thought have has been posted there one way or another. Just search up your question, and its likely been discussed. Of course, its not to be used as a primary teaching outlet, but it will aid any of the suggestions above greatly when used together with them. Think of Stack Exchange, and this section as ways of getting clarity of things that you have read or listened too, but don't quite grasp the concepts.
I believe following all the serious-minded developers, both the Core developers and some of the shitcoin developers, would also be good sources of knowledge, and insights where Bitcoin as a technology, and/or its macroecomomics are going in 5+ years. Although, we should not take their posts as “the final truth”.