Algebra I and some trig, at least to get pretty deep into a first college course syllabus and get enough exposure to see where you want to go with it. That "10th grade" level of math, for instance, is actually enough to get you pretty far into the practical applications of linear algebra in cryptography, but it's not enough to get you all the way to machine learning.

Thank you kindly! Its always nice to learn you’re more prepared than you supposed!

Yeah, read Basic Mathematics by Lang. Covers all precalculus you need in a rigorous way.

I’d recommend Kahn Academy. They have a way of quickly reviewing what you know. You ought to refresh any gaps in high school math. Then take the Kahn courses in linear algebra.

For more and deeper, see the other recommendations here.

That’s an excellent recommendation, thank you.