It is uncommon, but someday your computer may tell you that it is running low on disk space. Using File Explorer or Finder, you can often sniff out some large files to delete and move on. But rarely, this turns into a mystery. Sometimes a drive is full and you cannot easily tell what is clogging it all up. If you ever find yourself in this situation, you may need a disk space analysis program.
That’s just a generic name for what this type of app does. These programs quickly scan your hard drive or SSD and give you some kind of a map of your storage. This chart or pretty picture will show you how your storage space is being used. And this may give you a new insight into what you need to find and delete to reclaim your storage!

Here are some worthwhile disk space analysis apps for Windows:
And here are a few for MacOS:
Please note: I am only recommending the free versions of these programs, at this time.
Also, while I can provide these as tools to understand your storage, understand that these tools do not help you decide on what to delete or keep. You must know what you are doing, lest you remove something essential. Please listen to your gut and do not delete things you are unsure. Contact a professional if you need help cleaning up your computer!