What’s Layer 2 all about? Don’t worry, your class study rep is here to explain:
Layer 2 refers to scaling networks built on top of the Ethereum mainnet. They execute transactions off-chain, then write the results back to the mainnet.
Layer 2 saves money because it bundles many transactions together before submitting them to the mainnet, so the mainnet fees are shared among many people.
The home page of my trading notes says: Understand it before placing an order.
$ARB 0.1843(+4.24%)

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This is not a recommendation. Make your own decisions.