Who exactly gets the fee that pops up in your wallet?
Gas fees are worth understanding.
Layer 2 bundles many transactions before posting them to the Ethereum mainnet, so the cost is spread out and fees per transaction are usually much lower.
If you don’t understand something, avoid putting a large amount into it. It’s safer to practice with a small amount.
$ETH is the native currency used to pay Gas on the Ethereum mainnet. Currently 2372.35.