See how much storage space is used on your Mac and how much space is available.
Choose Apple menu
> About This Mac, in the window that opens click the More Info... button.
Storage is towards the bottom of the window that opens and will show the amount of space that is available. From more in-depth information click the 'Storage Settings" button.
The categories in Storage Settings contain the various files on your Mac. (If your Mac has more than one user account, the categories shown are for the user who’s logged in.)
Note: The categories do not correspond to specific folders on your Mac.
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Applications: Contains all the apps installed on your Mac (excluding system applications).
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Documents: Contains files in your home folder that aren’t included in other categories, such as Pages documents and PDFs. It also includes videos and photos that are not managed by your photo library (for example, an image that a friend shares with you using AirDrop).
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Mail: How much storage space is used by your email and their attachments
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macOS: Contains macOS system applications and files. Examples include Mail, Terminal, Calculator, and Time Machine Local Snapshots.
For detailed instructions, please review the following information from support.apple.com .