I self studied from this book as an undergrad. I was an EE major and took linear algebra as part of the mandatory ODEs class but didn’t “get it.” At a certain point, it became clear that if I wanted to learn the more advanced applied math I was interested in studying, I needed to really understand linear algebra. I thought Axler was great at introducing both the material and teaching me how to prove things rigorously. The month or so I spent that summer reading that book made the rest of the math I took in undergrad trivial.