To check how much space is available on a disk, go to the File Systems tab and look at the Used and Available columns.
If several devices are shown, and you are looking for the one that has your Home folder on it, look for the disk that has / or /home listed under Directory. This is usually (but not always) the disk where your personal files are stored.
If you don't have much disk space left, there are a few things you can do to try and free up some space.
One is to delete unwanted files manually. You can use the Disk Usage Analyzer application to tell you which files and folders are taking up the most space. After deleting some files, you should then empty the Trash to make sure they are fully removed from the computer.
You can also remove temporary files in various applications. For example, web browsers and software managers often keep sizeable temporary files around. (How you remove them depends on the application.)
You can also try uninstalling some unwanted applications. Use your usual software manager to do this.
Another way of freeing disk space is to "archive" old files by moving them to an external hard disk or online "cloud" storage, for example.
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