A wallet address
For the coin the pool mines — not an exchange address, unless you have confirmed it accepts mining payouts.
Nexthash does not mine anything itself: it points you to independently run pools. These four steps are the same on every pool, only the specifics change.
For the coin the pool mines — not an exchange address, unless you have confirmed it accepts mining payouts.
A CPU-mineable network gains nothing from a GPU or ASIC, and the reverse is also true. Check the pool's mining type first.
Most pools reward the shares submitted over a window of time (PPLNS): staying connected matters more than chasing the biggest single burst.