They are diferent curency then Bitcoin.
First tab are different altcoins traded with Bitcoin, or BTC pairs.
Second tab are different altcoins traded with Ethereum, or ETH pairs.
Third tab are different altcoins traded with Monero , or XMR pairs.
Fourth tab are different alltcoins traded with Tether, or USDT pairs.
Yes, so instead of trading alts against btc, you are trading alts against whatever other alt the market is.
Good luck out there!! Don't give up too easily, becoming proficient takes time..