Yes, this is car related. Tangentially.

I realize working on my Alfa that my math skills are terrible. Possibly non-existent. I haven't "done" math since 1993. I get flustered with basic fractional computations. This is a shame, because I'm fascinated by mathematics, especially areas like astrophysics. I want to relearn or teach myself what I've forgotten or never learned in the first place.

So, does anyone have a recommendation for a resource to relearn mathematics? Let's start with basic Algebra. No, I cannot attend a community college class due to my work and family schedule, at least not right now. I'm more interested in online courses or materials, books, apps, whatever, to reteach myself the basics.