I am asking because often times one doesn't know where to start in math. "Just learn what you need" is very vague and unspecific ... for example, assume I'm a beginner at Algebra and was considering 3-D programming with OpenGL and C++. Not bothering to mention anything programming specific here, let's assume I must know vector math.
Does that mean:
1.go straight to vector math tutorials/books/etc. and learn it;
2.learn whatever prerequisites are recommended before vector math/linear algebra;
3.do something else.
Basically, what if I go straight to vector math and "don't get it"? Then what? Do I just linearly learn it or patch up some misinformation? Would I be learning vector math if I haven't even completed Algebra I yet? A little muddled on some Pre-Algebra as well?
Basically, again, at this point what is one expected to do? Do I need to learn it all from the bottom up or can I just "pick what I want" and learn it without caring about prior subjects fully or future ones?