if you are in the crypto field you have been aware of hacking scamming and protect yourself from hacking. There is a list of plenty of exchange that has been hacked like.
2019 DragonEx exchange
2019 Gatehub exchange
2019 Binance exchange
2019 Upbit exchange
2019 Bitpoint exchange
2019 Bitrue exchange
2018 Bithumb exchange
2018 Bancor exchange
2018 Zaif exchange
Dec 2017 YoBit exchange
I suggest you store only a small amount of funds in exchange and put your 90% fund in a digital hardware wallet or if you don't afford wallet you can store your fund in Decentralised wallet which you access to your private key.
decentralized wallet: trust wallet (by binance)