Excel Tips: Security > Protect Cells
Encrypt or Decrypt Cells
How to encrypt/decrypt selected cells in Excel?
How to only hide part of cell value in Excel?
How to quickly hide cell contents in Excel?
How to quickly hide cell values in Excel?
Protect Cell Formatting
How to lock cell width and height from resizing in Excel?
How to lock column width in pivot table?
How to protect cell formatting but only allow data entry in Excel?