for safe trading, you can use trading platforms binance, bittrex, kucoin, okex, bitfinex, bitmex, kraken. but to ensure profit from your trade. the key is Learning. no exchange guarantees your profit on investment / assets. the guarantee is you. by learning to trade, initiate action, understand risk, and make consistent trading. because the exchange does not guarantee your profit. the platform only provides commodities / crypto currencies only.
There's no guarantee in any exchange, it's the traders obligations to learn how to manifest and getting profits while using the platforms. You are the one
that needs to work for your investment, trading site gives you the opportunities to trade with other traders around and gives you the chance to earn when you have the right mindset and position each time you invest your money.