Reset your Mac

1. If using macOS Ventura or later:
   1. From the Apple menu in the corner of your screen, choose System Settings.
   2. Click General in the sidebar.
   3. Click Transfer or Reset on the right.
   4. Click Erase All Content and Settings.
       
2. If using macOS Monterey:
   1. From the Apple menu in the corner of your screen, choose System Preferences.
   2. From the System Preferences menu in the menu bar, choose Erase All Content and Settings.
       
3. An erase assistant opens. Follow the onscreen instructions. Before the erase begins, you will see a summary of all the settings, media, data, and other items that will be erased or turned off.
   • When asked to sign in with your administrator credentials, enter the password that you use to log in to your Mac.
   • You might be asked to enter your Apple Account password so that your Mac can sign out of Find My.
   • You might be asked if you want to back up your Mac before resetting it.
   • After you click the Erase All Content & Settings button to confirm that you want to proceed, your Mac restarts and briefly shows a black screen or progress bar. 
      

     

Source: https://support.apple.com/en-us/102664