1. That's basically it. Explore to the best of your abilities, take note of your surroundings for shortcuts, hidden paths, etc. In dark souls 1 it was entirely possible to go to locations out of order, and often in that aspect was much more open world, whereas the later games usually have a more linear progression (though you still have to find the branching paths and secret areas on your own). For instance, in Dark souls 1 you supposed to ring the two bells. The crestfallen knight tells you where they are, but does not direct you to them, only saying one is up and the other is far down. By moving in one direction, you will eventually have visual of only one path that goes up, and beyond that you can see what appears to be a cathedral. By being observant, you can properly find your way. 2. Multiplayer is still the same. Put down a sign, get summoned to complete the one area, and then move on. They have made it considerably easier to do this in the 3rd game, by setting a password that matches you only with others with the same password. PvP is done in 2 ways. The first is invasion, forcing your way into other players' worlds to PvP. This is involuntary, and interrupts the host, though in Dark souls 3 it is heavily weighted towards only invading those who are already co-oping. The 2nd way is by placing down a red soapstone, which allows players to willingly summon you for PvP. This usually involves an honor code, and unless trying to have a fight club should always be 1v1. There is also a complex rivalry system this time around, as well as the mad covenant, the mound makers, but those are just variables.