Libs, externals and memory usage oh my!

[Aequi]

Ok, so i'v been a slave of mazzle - which ofcause mean i had everything handed to me on a silver platter, but now i'm putting the eccentials together myself, but i never quite understood the whole libs and externals thing and how it impacts the memory usage of your whole interface.

Once i got something that more or less works, can i just start to move libs from inside the mods and place them in the addons-folder???