There's an excellent, very pedagogical, playlist on a tangential subject - Tensor Calculus - and halfway along the course it mentions and recommends these cours

There's an excellent, very pedagogical, playlist on a tangential subject - Tensor Calculus - and halfway along the course it mentions and recommends these course notes for more exercises about curves and surface curvature. Playlist: https://www.youtube.com/playlist?list=PLJHszsWbB6hpk5h8lSfBkVrpjsqvUGTCx https://www.youtube.com/playlist?list=PLJHszsWbB6hpk5h8lSfBk...