If you suspect that you have some large duplicate files on your Mac, you can find them without any special software. You can use the Finder to search for files and sort them so duplicates are together. You can also use the Terminal to find duplicates with a multi-part command.
You can use the Terminal to list files and folders, restrict the lists to only large files and folders, and also just show the ones that use the most space.
If your hard disk is full and you need to clear out some space fast, here are 20 places to look. In macOS Monterey you can use the Storage Manager to clear out a lot of unneeded files, plus I'll show you some places to look in your Library folder, Applications, Photos, Documents, iCloud and more.