Every single year many exchnages was hack and that is not good because the traders funds is in danger and earning money is not easy and the hacker will get the money so fast that is not reañly good for them . This year I want that I cannot see any exchnages that being hack .

Has Okex been attacked before? Why have I never heard of this news, have I missed it. Okex is a leading exchange in this market and I also often use it to buy some altcoins. If it is really hacked, I feel scared of the exchanges in this market

Yes bro, Here you can read the complete details:
https://www.google.com/amp/s/cointelegraph.com/news/chinese-bitcoin-exchange-okex-hacked-for-3-mln-police-not-interested/amp

And it goes on and on, Indeed i must say thank you and wish a lot of people will come across it therefore knowing that no matter how advanced, attractive or good an exchange is, it is still susceptible to hacking which is really disturbing. In essence, saving of funds on exchanges is a very very bad idea and this list of hacked exchanges just proved it right. Nevertheless, even at this, one thing stands out and that is, despite all these hacks, the crypto space is still moving forward which shows that it is solving a pressing human need, which is the advancement of cryptocurrencies.

I never had this kind of information. If all information is right than looks like every top exchange got the hacking test. After any protect you took always hack problem still exists, we only safe in blockchain. We're not safe any more if we send money to exchange where we have no control.

OKEx was hacked in 2017 and hacked 200 Bitcoins within one hour from a German IP. We know 200 Bitcoin was around $4M of that time in value. In my experience, most of the exchanges has been hacked either once or twice. It is a regret that Exchange hack is now a common fact and investors trade now in risk.

Im sad that i still have some coins on cryptopia exchange when they has been hacked.
Fortunately i don't have much amount of coins there.
We should not saving coins too much on exchanges because the risk is always there, we don't own the wallet.

As far as I know etherdelta should be included on the list caused by it's a DNS hack. ED lost nothing caused by this hack but people were being fallen to the phishing that already created by scammer us ED DNS.
I remember when okex gets hacked and this exchange is doing good right now with its security

Very common to every traders not to store that much investment from any exchange. It's better to keep your money inside your own wallet and only store amount of assets that you need to use whenever you do your trading. The risk is too high as mentioned since every hackers are eyeing to any opportunities that will lead them to penetrate the exchange.