When you say " ... For those you leave them in your unlocked wallet, and they give you more coins "
What kind of wallet does this need to be? Can it be Poloniex?
When you say " ... For those you leave them in your unlocked wallet, and they give you more coins "
What kind of wallet does this need to be? Can it be Poloniex?
It needs to be the coin's wallet that you download and run on your computer. Leaving your coins on Poloniex, or any exchange, won't earn any interest for you.
Ok thank you for the clarity!
Also worth mentioning the obvious: it's not safe to leave your coins on an exchange, you don't own the private keys so you don't actually own them.