So Ive invested into couple of coins and currently holding them on a exchange. Is it good idea or should I download a wallet. For an example what is good wallet for Ripple
Regards
Do not download anything, just buy a ledger wallet and try to store everything in there, it has almost a specific wallet for almost all the cryptos (the most important ones of course, ripple, eth, btc, ltc, and so on)
If you want to store your ERC20 tokens, just store them all on your MEW, but try to protect it with an encrypted Json.