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.
This is totally right, As of now that many exchange got hacked that's why i never hold my coin in exchange if i want to hold it i will withdraw it and hold it in my wallet to make it secure