https://www.youtube.com/watch?v=eBjuKoCN-0A&list=PLTjLwQcqQzNKzSAxJxKpmOtAriFS5wWy4
Here we introduce tensors of zeroth, first and second order, which are a generalization of scalars, vectors and matrices. More: https://en.fufaev.org/tensors
Books by Alexander Fufaev:
1) Equations of Physics: Solve EVERY Physics Problem
https://en.fufaev.org/physics-equations-book
2) Alexander Fufaev and His Never Ending Story:
https://en.fufaev.org/lifestory