Ah I've always used DestinyLFG since it catered to all 4 platforms I figured it would be more popular. Ended up making some friends on there as well that helped me catch up with gear later on, so that's always an option.
Like most multiplayer games, Destiny is better with friends, hell if I still played and was playing this expansion I'd help anyone who posted here provided they're on my platform.
You get to travel to different planets and explore some of the catacombs in them. Also boss fights are amazing.