There are YouTube videos covering these specific areas but I'm not convinced I could recommend them. Nevertheless, here are 3 for you to try and make your own mind up. They are at least free.
Mastering the Middlegame with Atul Dahale : Aaron Nimzowitsch : Prophylaxis! (link at about 15 minutes in because before that it is mostly irrelevant drivel)
Alex (may he RIP) told me: "Nf3 I can choose whether or not to play d4 and when...if at all. With Nf3 I blackmail the opponent. With white I play for solid advantage and black has to play precisely not be worse. With black it is worth it to play more "dynamically" and take a risk.