If you wish to hold some coin then use exchange only for during exchange. Just exchange your coin and transfer on your personal wallet that you have controlled. Specially you can use hardware wallet.
Because many exchange hacked buy hacker. Many people loss their capital by hack.
So please don't hold your coin on exchange for long time.
Actually thanks for this your good advise bro,thats dont put all our coins in the exchange market because mostly of the exchange now been a victim of hacked and people loss there capital because of hacking system,otherwise,i must hold only my crypto coins in my MEW wallet only even though its not must safe compared to Nano Ledger or trezor edge portable wallet.