A few words on private keys and addresses:
An Ethereum address is derived from the last 20 bytes of the Keccak-256 hash of a public key. It is written as 0x followed by 40 hexadecimal characters.
You can derive an address from a private key, but you can't calculate the private key from an address alone, so it's safe to share your receiving address with others.
There's no need to export your private key unless necessary. If you do need to export it, don't copy it into an online notes app.
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