While keeping your passwords in an Excel sheet on your desktop may seem like a secure solution, there are several reasons why it is not recommended:

No Encryption: An Excel sheet does not offer any encryption to protect your passwords from being accessed by unauthorized users. If someone gains access to your computer, they could easily view and copy your passwords.
Vulnerability to Malware: Malware or other viruses can infect your computer, giving hackers access to all the files on your computer, including your Excel sheet containing your passwords.
Limited Accessibility: An Excel sheet saved on your desktop is not easily accessible from other devices or locations. This can be problematic if you need to access your passwords on the go or if your computer crashes or is lost or stolen.
Difficulty of Management: Managing your passwords manually in an Excel sheet can be cumbersome and prone to errors. It can be challenging to keep track of multiple passwords and ensure that they are secure and up-to-date.

Instead, it is recommended to use a dedicated password manager that offers encryption, secure syncing across devices, and advanced security features such as multi-factor authentication. This will help you manage your passwords securely, reducing the risk of data breaches and unauthorized access.