I did not find the crash course in Linear Algebra to be useful. I had to complete Strang&#x27;s course (ocw.mit.edu&#x2F;courses&#x2F;mathematics&#x2F;18-06-linear-algebra-spring-2010&#x2F;video-lectures&#x2F;) before doing Andrew Ng&#x27;s course , after which most of the course seemed easy.