What exchange do you buy/sell your cryptos? What is the best? How have you chosen the one you use?
The choice of exchange floor depends a lot on the cryptos you want to exchange. If it is Ethereum, then OKEx is very popular in the exchange ETH to USDT and BTC, the total trading volume accounted for 8% of the market. You can select the exchange floor quickly by looking at Coinmarketcap corresponding to the cryptos you need to exchange.