Metamask can be connected to Avalanche. This video will show you how to setup Metamask, get an Avalanche Wallet, add the AVAX Custom RPC to Metamask, import Avalanche seed phrase into Metamask (or the private key), test your wallet works, and finally explain how to send AVAX from the X Chain to the C Chain.
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https://www.youtube.com/watch?v=loq3OrAzk6c