Just keep ALL coin away from exchanges unless you are trading. I personally use Ledger Nano S. Anything you trade regularly, make sure you have your own wallets for each currency and move your funds in and out - it's worth the inconvenience for your peace of mind. I think it's only a matter of time before one of the big exchanges get hacked again. If you use MEW, do so locally, or again, ideally with a physical wallet.