Who exactly gets the fee shown in your wallet?
First, a definition: when a transfer fails, the Gas already used is usually not refunded, since validators have already done the work.
How it works: Layer 2 networks bundle large numbers of transactions and submit them to the Ethereum mainnet, so the cost per transaction is usually much lower when shared across them.
$ETH is the native coin used to pay for Gas on the Ethereum network.
If you're unfamiliar with a product, avoid taking a large position at first. Try it out with a small amount before doing anything more.

#ETH