quickly is more like "hasty" or "hurry up" in some way.

I think "fast" word use for If someone is runing then there is use "fast word"...example... He is funning very fast at way.

And second "Quickly" word use for If somone is wanna catch "vehicle" then there is use "Quickly"...Example....He is coming quickly because he wanna catch vehicle.

I think so...I hope it's helful to you..!!

There is another word very similar to words you mentioned "rapidly"

I am not very sure the exact difference among them but I share some experience with you as much as I know

fast ---->  Moving or capable of moving at high speed (distance per time)

quicky----> Moving fast or doing something in a short time (not focus on mathematic calculation)

rapid---->  Happening in a short time or at a great rate ( similar to dramatically)

It is the object that "fast" and "quick" are different from each other. The word "fast" refers to the speed in process. But "quick" puts more emphasis on action. For example, he is a fast reader means that he may read ten lines in a second. However, he can't finish a thick book in ten minites. But he is quick at a specialized book.

Hope to be helpful.

There is not much difference, except the context- this will come with practice.

E.g. We would be more likely to say, He runs very fast

E.g. We would be more likely to say, When I called her, she came very quickly

Hope that helps! If you want, I can help you with your English.

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