Poe is said to be a good way. But if you don't have enough for that bounties, strikes and crucible are good too. Ranking up in a faction gives 4 so that is good too.
If you are on Xbone I can help you with POE because I think they drop fairly often there
English
-
What does the acronym for POE stand for? Hehe, still kinda new at this.
-
Prison of elders