Let's talk about centralized and decentralized exchanges.
PancakeSwap is one of the commonly used DEXs on BNB Smart Chain, and $CAKE is this DEX's platform token.
To be honest, I hadn't noticed this before either: price impact is usually high in obscure pools on DEXs, so check the estimated amount you'll receive before swapping.
$BNB is both a core token in the Binance ecosystem and the native currency used to pay gas on BNB Smart Chain.
For products you're unfamiliar with, avoid taking large positions; trying a small amount is safer.

#BNB