To start trading, first we need to choose a platform, here are the platforms I use.
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Bicoin: Bithumb, Bitfinex
Tether(trading TUSD or USDT): Binance, Bitmart
ETH: all of above
Welcome to other suggestion

Why do we need to split up so many trading floors? Why do not we trade at a single exchange? I am wondering about this issue and hope you will help me. I'm a beginner to trading. thank you.