Administrative Rights
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… authorize the installation of software, including malicious software.
… enable unwanted changes to the system configuration.
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Only work with administrative rights if absolutely necessary.
Avoid surfing the internet with administrative rights.
Do not use the password for an account with administrative privileges for other accounts.
User Accounts and Admin Rights | BSI
If multiple people use the same device, such as in a household, separate, password-protected user accounts should be set up for each person. This ensures that private information remains protected and that important data is not accidentally deleted or damaged by other users.
Source: BSI