How to Obtain Arbitrum ETH
There are multiple ways to obtain Arbitrum One ETH (a.k.a. AETH or Arb ETH), but here are the best ways depending on your starting point.
In this case, all you need to do is bridge ETH on Ethereum's network to ETH on Arbitrum's network. To do this, navigate to the following site then follow the steps below: https://bridge.arbitrum.io/?l2ChainId=42161.
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You can buy ETH from Centralized Exchanges (CEX) that support withdrawing to an Arbitrum network. The following are popular CEX's:
via Binance: https://www.binance.com/en/how-to-buy/ethereum
via Coinbase: https://www.coinbase.com/how-to-buy/ethereum