3 blue 1 brown is a youtube channel that teaches math concepts. I've found it a much better introduction than other resources I've looked at. The Essence of Calculus series was particularly good.
But one issue is that, while the videos come with a few exercises sprinkled within (typically one per concept), they don't come with enough to really check whether I understand a thing.
Last year I tried binging the channel but kept running into issues where I'd want to do additional practice, so I'd try Khan Academy or Brilliant.org. But it felt like the exercises were introducing concepts in a fairly different order, or without using the same metaphors/explanations/keywords that 3-blue-1-brown was. So it was hard to tell what exercises corresponded with what. (Brilliant.org was better overall than Khan Academy but still felt like a completely different lesson plan, with somewhat less-good-explanations)
Eventually, bouncing between brilliant.org and 3 blue 1 brown resulted in me running out of steam and giving up.
I've emailed the creator about it but even if they were excited about it I imagine it'd be quite a while before anything useful came of it.
I'd be generally interested in a project of crowdsourcing exercises that correspond to individual 3-blue-1-brown videos. Since I'm currently trying to re-ignite my interest in the Linear Algebra series I thought I'd ask specifically about that, although if people happen to have cached thoughts about other series that'd be cool.
If you want a proof-based approach, Linear Algebra Done Right is the typical go-to that's also on the MIRI page. I went through maybe the first 3/4ths of it, and I thought it was pretty good, in terms of number of exercises and helping you think about manipulating vector spaces, etc. in a more abstract sense.
Otherwise, I've heard good things about Gilbert Strang's MIT OCW course here: https://ocw.mit.edu/courses/mathematics/18-06-linear-algebra-spring-2010/.
In general, I think that 3B1B's videos are really good for building intuition about a concept, but trying to do exercises off of the pedagogy in his videos alone can be quite challenging, especially as he often assumes some mastery with the subject already. (EX: In the eigen-stuffs video, he doesn't actually explain how to find the eigenvalues of a matrix.)
Thus, I think it makes more sense to stick to a traditional textbook / course for learning linear algebra and using 3B1B as supplementary stuff for when you want a visual / different way of looking at a concept.
Also, it might be worth checking in to see what you want to learn linear algebra for. I suspect there are more domain specific resources if, for example, you cared about just the useful parts of linear algebra used in machine learning (dimensionality reduction, etc.).
Nod.
But, I've attempted that and mostly bounced off it because it felt too much like work. It might be the answer is "if you want to actually learn this thing you have to do the actual grownup thing" but by default I'm orienting around something like "the thing that seemed fun except that I didn't quite have enough resources to grok it, can I make it work better?" than "how do I seriously pursue learning math?"
(At least for the calculus videos I'm also skeptical about whether the "mastery is assumed" problem is especially bad, although I can imagine this being true for many of the more advanced stuff)