I was reading this answer that suggested df -h for checking disc space. But in the comments, another user suggested df -h --total and at this time has 93 upvotes.
I tried both df -h and df -h --total and the output is the same on my device.
I used men to see what --total does and this came out. I don't quite understand it either. a little elaboration would be appreciated.
elide all entries insignificant to available space, and produce a grand total