How much space is being used on your hard drive?

How much space is being used on your hard drive? I'll admit, mine's running low - severely low. I've had to move countless photos to an external drive over the past few months, but have since downloaded gigs more of images from my camera. This next update may be a doozy.

Full hard drives could cause an upcoming Windows update to fail, according to Microsoft, and the system will not check for adequate storage space before installing.
https://www.howtogeek.com/fyi/microsoft-upcoming-windows-update-might-fail-if-your-hard-drive-is-too-full/