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.
Thanks bro,for this your good advise in doing some holding capital in exchange trading,actually all of this happen mostly difenitly true,and alarming,because when we put up our crypto coins in the tradings exchanges that we would like to make a transaction,so that its ready to exchanges it to fiat or convert to another altcoins,we could not assure that if there something happen those trading site's our crypto coins would return in exact value,or return back to you in good hands,thats why its discourage to put some of our portfolio in the trading sites,in order to aware of hacking system.