First video on the Gradient vs d operator: https://www.youtube.com/watch?v=nJpONHO_X5o
Videos on Tensor Product from my "Tensors for Beginners" series:
Video 11: https://www.youtube.com/watch?v=YK2zVcWpROA
Video 12: https://www.youtube.com/watch?v=uDRzJIaN2qw
Video 13: https://www.youtube.com/watch?v=qp_zg_TD0qE
Video 14: https://www.youtube.com/watch?v=9R4vhqvE_jw
Video 15: https://www.youtube.com/watch?v=M-OLmxuLdbU
