I am trading cryptocurrency in Korea,and I am using two different exchange platforms: a exchange called Dove Wallet and Binance, due to liquidity and also a price difference called Kimchi Premium. Is it common to use two or more exchanges?
I know people which use 20+ exchanges, just to be able to trade most part of existing coins. It depends on what you are trading. If you are just trading Bitcoin and Ethereum, you are actually fine with one big exchange with good liquidity. If you trade many altcoins then you would be required to use more exchanges.