Essence of Linear Algebra

In computer science as in many domains, the use of Linear Algebra is central. Whether you want to apply dimensionality reduction in Machine Learning, apply any transformation to a matrix, Linear Algebra is the key to your problem.

I can only recommend the geometric explanation of Linear Agebra by Grant Sanderson in a 15 video series.

The videos are remarkable and using great 3d visuals. You will get a better understanding (often very different from the one you got during your studies or in books) with ease: