If anyone recommends that you change the Advanced Options for a user, please read this first. It could save you a lot of pain and grief.
Many problems result from settings within your user account, or in your Home folder. Creating a new user helps you work out where the problem lies, and can work around the problem itself.
Why does almost every Mac user use their system in an admin role? Shouldn’t macOS encourage us to be ‘normal’ users?
When should you create a new user, and how should you delete them?