>>14208522This.
There is also a reason certain textbooks are extraordinarily popular in universities. Gonna say it, Lang's Basic Mathematics is a dogshit book filled with gaps. Stewart's precalculus is significantly better and prepares you for calculus.
As for calculus itself, again, there is a reason why Stewart's book is so popular, its very good. Spivak is only used in Honors or Advanced Calculus in universities, and if you're asking how to learn calculus on 4chan... you should not be reading that book until you finish the calculus series and have taken an intro to proofs course.
If you want a comprehensive understanding of Calculus, you will need at the very least, a semester and a half, assuming you follow a consistent course of study in accordance with an 8week term. This will be something like 15 hours a week of calculus, consistently.
