For that 3Blue1Brown is very good for this.
https://www.youtube.com/@3blue1brown
Better Explained as well, but focuses more on how to understand the concept so you can start to learn.
https://betterexplained.com/articles/linear-algebra-guide/
They are good if you already know a subject well, and want a new perspective on the material though.
They have training video series as well. Even one on Linear Algebra. Starts from scratch and works up to advanced.
I do say this as a fan of both, though.
They are good if you already know a subject well, and want a new perspective on the material though.