Bitcoin Core Wallet.dat -

Records of your transactions, including labels and comments.

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: There are no "backdoors" or official password recovery features—this is a security feature of Bitcoin. If you've lost the password, you are effectively locked out of those funds.

Encrypting your wallet adds a password requirement to spend funds or view private keys. Bitcoin Core Wallet: Forgotten Password - What Can You Do? Bitcoin Core Wallet.dat

The blockchain data ( blocks/ and chainstate/ folders) can be deleted and re-downloaded. The wallet.dat file is irreplaceable .

Information about account names and transaction notes.

Close the software completely to ensure the database is not in use. Records of your transactions, including labels and comments

The single most important thing you can do is . Bitcoin Core has a built-in encryption feature.

Encryption transforms your wallet.dat into a file that is completely useless to anyone who doesn't know your password. This password is essential: .

If you encrypt your wallet, the file is essentially a plaintext list of your private keys. Anyone with the file can spend your coins immediately. I should also include recent developments and expert

The cryptographic keys necessary to sign transactions and move funds.

New addresses generated by Bitcoin Core might not be covered by old backups.

To create a new wallet: bitcoin-cli createwallet "newwalletname"