What Exchange do you use and why?
What Exchange would you recommend and why?
Any complain about some exchange?
Any Exchange has give you problems or difficulty with to withdraw your money?
For altcoins, I prefer Kucoin and Binance. Unfortunately, not all coins are available to trade there so I have to use other exchanges as well, like Bittrex, Poloniex, and even Livecoin. As long as you practice safety 101, your accounts will be save. Just hope those exchanged won't get hacked lol. Didn't have any complain so far nor I have experience any trouble withdrawing my money.