Advice on how to learn to intergrate librarys and engines


I’m looking for general recomendations and tutorials in regards to learning to integrate engines and library code into my projects. I think I have the very basics of AS3 sorted, or at least I know how to figure them out (alot due to this forum).

my end point is I’d like to be able to use something like the the motor 2 engine

I’d love any recomendations on how to go about learning to use these.
Love to hear how other people managed to learn to use these.
Any tutorial recomendations greatly appreciated.

Thanks for taking the time.
All opinions most welcome!!