Let’s talk about centralized and decentralized exchanges.
Every swap on a DEX is an on-chain transaction, so you have to pay the chain’s gas fee.
To be honest, I only figured this out later: CEXs are more convenient for deposits, withdrawals, and customer support; if you want to control your own private keys and use on-chain apps, you need to get familiar with wallet security.
$BNB is both a core token of the Binance ecosystem and the native coin used to pay gas on BNB Smart Chain. It’s currently 704.66.
Don’t rush into anything you don’t understand. It’s safer to start by practicing with small amounts.