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.
Platforms list different coin by their choice, if you are NOT only trading on BTC, ETH

ALSO, they have different rate on the same coin! you can see the link below,
https://coinmarketcap.com/currencies/bitcoin/#marketseven BTC, some rate higher and some are lower.
Some investor trade at the different platform for the rate difference to get revenue.
