You have several options with this tool.

(1) Remove temporary files: This removes those files from the tmp folder.

(2) Remove macOS Installers: If you have any installers in your Applications folder, the script can remove those (which is nice because those installers can get up to 12 GB!).

(3) Fix drive permissions: When creating the Application, or when modifying macOS Installers, certain disk images may or may not mount invisibly. This tool will unmount those disk images and then fix any issues it may find on your Mac's startup drive.

(4) All of the above: Runs all of these tools.

You will need to enter your password for these tools.