I just got into ranked, and I have some understanding of the basic concepts from watching people like Helseth and Sindrener, know the map mechanics, etc. but don't really have a solid understanding of how to play. For example people speak of "rotation" but is there a general expectation about how you are supposed to rotate? And how are you supposed to open (1 cap home, rest go mid?)? Do you +1 as often as the opportunity presents itself, even in the middle of nowhere? How important are the various map objectives compared to capping nodes?
And more specifically for Mirage: what are the basics of portal placement (I'm just dropping them as often as possible near nodes)? Am I supposed to hold a point if I can, or leave it to a bunker? When should I join teamfights or search for caps? When faced 1v1 with a bunker, how long do I try to kill him until I give up and leave?
Everything is ultimately going to be situational, but I'd like to know if there are any basic guidelines or unspoken rules.