VERY IMPORTANT.
Following the hack of a Japanese exchange a few days ago to the tune of over $700 million dollars, there seems to be more trouble on the horizon. As the markets are bouncing back it is important to keep an eye on one exchange in particular, Binance. It is backed by Tether dollars (USDT), and the idea is that each USDT is equal to one US dollar in trade. That crytocurrency can be used to trade for Bitcoin and lot's of other cyrptocurrency. So in theory if everyone wanted to trade their Tether dollars for cash, and get out, then there is a bank that has the money to do that.
The issue is that there is no proof to back this up. Now according to sources, they have parted ways with a firm that was doing an official audit to give assurance to the market that Tether is legit. We know this because Tether has confirmed it. If nothing else this is a huge crack in the confidence of Tether, and any exchange using it.
That said, the choice is yours to make. If you deal in Crypto you should always control your own keys, and not leave it up to the exchanges. When situations like this occur, it's almost a must to put your coins in a hard wallet. Take care everyone, and be careful.