I've made the most progress watching Chessbase videos. Euwe, Davis and Norwood, and probably others have good book on it. It gives good rules of thumb about imbalances, good vs. Colloquially it is sometimes referred to as a "horse", which is also the translation of the piece's name in several languages.
I would stick with YouTube videos and online lessons that will teach you about good and bad bishops and all that stuff, but I think until you get to a point where you're not blundering pieces, then any strategic knowledge will be really difficult to apply in a game. X Preview of embedded puzzle OK. Its almost impossible and counter productive to imitate a style you dont like. I realize that pawn hunting in the opening is bad, but if they lay one out there