We always give credit for the tips here, but I can’t find any information on this author, other than their YouTube username, TriJerett. Make sure you visit their profile and thank them for their video.
In this longer video, TriJerett focuses on four main aspects: Body Position, Catch, Pull, and Propulsion or kicking. Make sure you take notes because these drills will really ability in the swim and improve your form and power.