Depending on the OS you are running, there are different ways to find out what is using up all your computer’s disk space.
WinDirStat – https://windirstat.net/
There are a few MacOS apps that I have used and they all work pretty well:
Disk Inventory X – http://www.derlien.com/
DaisyDisk – https://daisydiskapp.com/
QDirStat – https://github.com/shundhammer/qdirstat
From a command line:
du -sh -d 1