The best intro to linear algebra, bar none, is the MIT OpenCourseware Intro to Linear Algebra, recordings of a course taught in 2005 by Prof. Gilbert Strang: https://ocw.mit.edu/courses/mathematics/18-06-linear-algebra...
"It seems the reviewers who think this book is wonderful for non-math majors are math majors!"
https://www.amazon.com/Introduction-Linear-Algebra-Gilbert-S...
...I of course expect that any popular book will have 1 star reviews, especially by people who had a hard time with the material. Anyone have thoughts whether the Strang book is better as a supplement to other texts in coming up to speed on Linear Algebra? Other book recommendations?