Marty - what is your level of study? Once you feel you have the basics down (linear algebra, calculus, network analysis will be the hardest bits, just an understanding without application level skill will be enough in these cases, to start off) subscribe to this comprehensive, free, certificated course from MIT:
https://6002x.mitx.mit.edu/The secret to electronics is to learn to enjoy the mental torture that comes from turning a problem around and to realise that the way out is through slow, steady mental plodding - just like this course
