2 Answers
+ 2
Well, it really depends on personal learning speed. You need to go fast enough to make progress, but slow enough to understand it. One method I've used and recommend to other people a lot is after every lesson, try to recount everything they taught you(after the quiz and questions as well), and if there's holes in your understanding go and do it again. According to me, by the end of the course you should be able to teach someone else what you were taught(or at least confidently explain it).
+ 1
Take your time when learning.
No need to rush