I have at least 6 different altcoins sitting on Bittrex and Binance.
Since I am still pretty new to trading cryptos, I would like some advice on how to keep these coins safe?
It seems there is no wallet which will be able to store all available brands of coins.
So what do you more experienced traders do with lesser known coins, if you cannot find a wallet?
enable 2 factor authentication. it may send a message to your email or via google authenticator. i know that bittrex and other big exchanges are 2fa ready.
another tip on phising, bookmark all the legit exchange websites.
i hope my answer helped you!