You can lock only specific cells and ranges before you protect the worksheet and, optionally, enable specific users to edit only in specific ranges of a protected sheet.

Dynamic lock is a security feature that automatically locks your device when you are not around. It uses Bluetooth to pair with a phone, and locks the device when the Bluetooth signal drops below a certain …

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Caution: When you create a password for a workbook, write down the password and keep it in a secure place. If you lose the password, you can't open or gain access to the password-protected workbook.

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Follow these steps to lock cells in a worksheet: Select the cells you want to lock. On the Home tab, in the Alignment group, select the Alignment Settings arrow to open the Format Cells popup window. …

Dynamic lock: Shows information about dynamic lock, which is a security feature that automatically locks your PC when you're away, and a link to the Settings app to configure it

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To lock your file so that other users can't open it, see Protect an Excel file. To protect certain areas of the data in your worksheet from other users, you have to protect your worksheet.