Your hard drive can be filled with files that you consider to be junk, because they are too old or they take up a lot of space. Moreover, some files may be present whereas they are useless for you: files created by Windows or even incomplete downloads.
You can choose to scan your entire home folder (user folder) or just a specific folder. It is also possible to drag and drop a folder onto the Junk home page. When you have made your choice, wait until the results are displayed, which may take a few tens of seconds.
This section displays all the files found. Select the files you no longer want to keep by checking the box in front of each one. Finally, click on the “Delete” button at the bottom right. It is also possible to filter the files by clicking on one of the items below.
This section displays all files larger than 100 MB. The “Very large” section displays files over 500 MB and the “Extremely large” section displays files over 1 GB.
These are files that have been modified more than 2 years ago.
When you stop a download, the file is not deleted in case you want to resume the download. Delete files from your incomplete downloads if you are not going to resume downloading.
This section lists all the files used to install apps, such as archives in DMG or PKG format. If you do not want to keep these installation files, delete them.
The section displays all the image files created when you took a screenshot.
If you have copied Windows folders to your Mac, they will probably contain a lot of unnecessary files for macOS, like Thumbs.db files or Desktop.ini (folder customization files). It is not recommended to delete these files if you are sharing a folder between macOS and Windows.