Then limits come back when you have to perform them on derivitives and integrals. Then you learn some rules to do derivitives by hand and limits mainly come up in those derivations. I do recommend having a textbook for supply practice questions though. I had great success learning from Sal, and it helped me a lot when it came to the actual course.

Personally, I'm a visual learner and learn more from watching video examples. I think Khan Academy may help in aiding understanding some concepts you may have difficulty with but does not provide enough practice in applying the concepts you just learned (at least in applying them in various ways).11. Because first you begin with limits and using them to find derivitives, because derivitives are defined with limits. Khan Academy is great for learning calculus/ precalc. I would prefer using Stewart over Khan Academy as it has more questions and even slightly challenging ones towards the end of the exercises. I would suggest checking out a standard text like Stewart's Calculus (whether through a library or some other means) as it has a diagnostic test in the beginning that covers an array of precalculus topics like geometry, trigonometry, functions, and others - whatever you don't understand here or are not confident with will basically tell you what precalculus topics you need to review (the Early Transcendental edition of Stewart even delves into precalculus topics for the first chapter). I can share my experience as to your pre-caclulus question as I have just recently finished precalculus about a month ago and about to finish Calculus I now (not the rigorous type, and also I am assuming you are not looking for that kind of a review). This page has all the exercises currently under the Precalculus Math Mission on Khan Academy.

Khan academy answers pre calc