Here is a video series on tensors I've enjoyed: https://youtube.com/playlist?list=PLJHszsWbB6hrkmmq57lX8BV-o...
And this series by Dialect: https://youtube.com/playlist?list=PL__fY7tXwodmfntSAAyBDxZ4_...
And this series by Dialect: https://youtube.com/playlist?list=PL__fY7tXwodmfntSAAyBDxZ4_...
Hackernews user saivan started notes on eigenchris's tensor series videos.