I have a degree in mathematics. I'd definitely recommend Khan Academy for learning the basics of most subjects (I've used it for calculus, linear algebra and statistics) and seeing computational examples. If you want some "big picture," and especially geometrical interpretations of mathematics, I'd suggest 3blue1brown's Essence of Calculus and Essence of Linear Algebra series (the linear algebra one in particular is exceptionally enlightening).
Textbook-wise, I'd suggest almost any early transcendentals book. I personally used Rogawski in class, but I've heard Stewart is good too (he's more popular on Amazon, if that means anything). It isn't too hard to find rips of any calc textbook, and with a little searching you could probably find worked solution guides as well.
Axler's Linear Algebra Done Right is an amazing text which is very easy to read, but I wouldn't recommend it for a first-timer to linear algebra. It follows a basis-free approach of more abstract vector spaces, which I think can be jarring. I'd suggest sticking to linear algebra done in the real numbers with the standard basis first. Strang is pretty good, although I didn't use him personally.
However you go about it, if you want to "get" mathematics, you'll need to get to the holy trinity of mid-level mathematics: multivariable calculus, linear algebra, and then differential equations. Those three subjects play off of each other in amazing ways, and prepare you for whatever direction you want to go next.
For probability and statistics, I'd wait until you have a good feel for calculus (and for statistics, linear algebra). If you care about learning math enough that you want to learn calculus, learning baby-tier probability and statistics (business major-core) will be a waste of your time. I recently discovered Hossein Pishro-Nik's "Introduction to Probability, Statistics, and Random-Processes," which looks to be an absolutely amazing text. Pishro-Nik has made the entire course available for free online here:
probabilitycourse.com/
Another good resource is StatLect, although StatLect is better for a second course:
statlect.com/
Most importantly, please remember that you don't know math if you can't solve math problems. It's far too easy (and I'm guilty of this too) to just say "yeah, yeah, I know this."
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