Guys First do not judge me because I am a Full Member.
I just want to ask if you get to ask to provide ethereum wallet. What is the wallet you give and use? is this poloniex.com one of them?
It depends on where you are being asked to provide the ethereum wallet address. Firstly, if you are participating in a bounty campaign in ERC20 token and you have been asked to provide a wallet, then your best move is myetherwallet.com (MEW). Just generate a wallet there, save all your details and send the public address. (Please make sure you keep your priv key or the backup file you downloaded cause that is the only way you will be able to access it back easily on that platform). However, if it is just a normal address, there are so many wallet such as Exodus with multiple asset platform including ethereum and you can just make use of this. I chose Exodus since it gives you access to your private key as well.
But please, unless you want to trade, you do not have any business with poloniex and the rest. Don't ever leave your funds in an exchange wallet.