I can login using my password into my Mac, but isn’t working when I try to install or update an app

phako wrote:

My password works when I login, but it doesn’t when I try to update or install an app

neither for a single sudo command

what exact update or app ?

what exact Mac?

what exact macOS?

See these references—

Safely open apps on your Mac - Apple Support

Install and uninstall apps from the internet or a disc on Mac

If Terminal is your issue, verify you have given permission Full Disk...

>System Preferences>Security & Privacy>Privacy>Full Disk Access> use the +/- to add Terminal

Controlling app access to files in macOS - Apple Support

Is the User Account the Admin Account - predicated on there being a Admin and Standard account on this machine.