While I think 3b1b video's are great for developing a better understanding of the purpose of certain concepts, I don't think there's any way around ignore manually doing the problems with say Strangs Linear Algebra book since that's where you spend tim trying to apply these concepts to problems.
Agreed. Nothing beats practice when it comes to math. I know that I spend far too much time watching course videos, and no where near enough working through problem sets.
Working through some of Strang's problems has also helped me. 3blue1brown is a great introduction to give you intuition, but you cannot commit the skills to long-term memory without struggling through problems.
