I've decided it's time to just read straight through a linear algebra textbook. Is Strang still the standard?
@ZachWeinersmith We used Linear Algebra by Jim Hefferon in Math 310 at VCU. He put it online for free: https://hefferon.net/linearalgebra/
Free Linear Algebra text, from Jim Hefferon

Free Texts Mathematics and Computer Science, and more, from Jim Hefferon

Free math texts