guys I have many account in many exchange and tread market like cryptopia,coinsmarket,kucoin,treadshtoshi etc.
but I don't know which market are safe my coin for tread?
I believe that the safest exchanges are the most popular like Binance, Bittrex. They get big attention from hackers obviously because of the many people who trade on their platform. So they MUST take extreme security measures. But you should never keep your bags in an exchange. I recommend to keep strictly the bankroll you need for trading. Don't risk what you don't have to.

As my experience, I think that there is no safest exchange, nothing connected with internet is completely safe. Obviously every exchange has its own potential and its up to everyones feeling that which is much suitable with them, and you have yours. I suppose you to pick some famous exchange, which has a large number of people pays attention on it like binance, bittrex,kucoin and the like. But first and foremost, dont be too hurried to choose them, let take some research about it in order that you have information and then make a decision. In a short, I advise you to try to use some popular exchanges.
But it does not mean that we should stop working or using exchanges, the whole world is almost depending on internet, we can see a lot of online business and stores where people do shopping online, I think that there are some legit and good exchanges where we can feel more safe to use such exchanges.