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Khan academy and 3blue1brown are very good supplementary resources. They should never be used by themselves. You need an actual linear algebra book to go through too. Furthermore, if you want to learn more mathematical linear algebra (vector spaces, subspaces, etc.) then khan academy is completely insufficient.
I started with Khan Academy in the 'Pre-K - 8th Grade' section, starting from 2nd grade math, and working my way up towards 100% completion (Mastery Challenge) for every subject in every grade. Once I get to and finish the Algebra 1 and 2 section of Khan Academy, I have a college algebra textbook to continue my algebra studies.
Khan Academy is a good resource for so many things. If you already have basic calculus and linear algebra down, you might want to go for a more structured approach, while using Khan Academy as a reference. Here's some books and other resources that might help - mathematicalmonk on YouTube Mathematics for Machine Learning - Garrett Thomas
I think using Khan Academy with a textbook is always great. Learning to read textbooks alone is a really difficult skill to get used to. Having something explained verbally while also being able to follow along with the textbook helps a lot. Khan Academy also doesn't provide many practice problems, while a textbook does.
Khan Academy's linear algebra course is meant to be a helpful resource for linear algebra students, so it covers all the same topics that one would find in a college LA course. Reply reply RayanFarhat
Khan academy has a course on linear algebra, though to be completely honest, linear algebra is usually taught as a proof-based course and teaching yourself proofs is extremely difficult because it's hard to know when your proofs are correct or not on your own.
Khan Academy's linear algebra series helped me to understand the basics, but I ended up having to look for other sources. One example is that Sal Khan doesn't do any examples involving polynomial-vectors.
If you need some practice problems now, Jim Hefferon's Linear Algebra is a free textbook available online (as a pdf) on the topic, and it has, like 50ish, problems for each of the chapters, and each problem has a worked solution in the accompanying solutions book.
I do not like Khan Academies vids on linear algebra. Just took my final exam today, and man, Strang came in clutch. Worth the time if you really want to learn the concepts.
The scope of linear algebra is in it's generality. The MIT lectures will cover all of the core linear algebra concepts you need to know, from theory (although not in the form of rigorous proofs) to computation. Mastering the ins and outs will come down to how much you practise applying those fundamentals.