Best Practices and Resources for Asynchronous Javascript

i've been reading a lot from stack overflow and a book called"You Don't Know Javascipt" (which is a fantastic book series btw by kyle simpson) but im still struggling with asynchronous ajax scripting. Does anyome have any reaources for asynch js coding and promises? Im trying to pull jsons from apis and parse the data to assemble the next url for the next api call and do it in order (as one does) and im having a lot of difficulty. This kind of stuff is so central to the web i want to just make sure im not shooting myself in the foot when i code these calls. Any and all help and recommendations would be greatly appreciated thanks!