Complete playlist: https://www.youtube.com/watch?v=W2uOamkVAFw&list=PLlXfTHzgMRUKG7lkye7DQAmNB0cfWNgWG&index=1
https://grinfeld.org
https://www.patreon.com/PavelGrinfeld
https://grinfeld.org/books/An-Introduction-To-Tensor-Calculus/
https://grinfeld.org/books/A-Tensor-Description-Of-Surfaces-And-Curves/
