Start with [Essence of Linear Algebra](https://www.youtube.com/playlist?list=PLZHQObOWTQDPD3MizzM2x...) by [3 Blue 1 Brown](https://www.youtube.com/channel/UCYO_jab_esuFRV4b17AJtAw) for an intuitive overview of all the major concepts.
While working through a full Linear Algebra course, it is important to develop your own software to do things. That is, some sort of command tool to enter matrices and run operations on them. As you go through a course, you will keep adding operations.
You should work on some of the most common tricks, like using 4 by 4 matrices for computer graphics and understanding what a PCA does.