So I kinda wrote a thing wrong, but the question remains. My home as 100GB and it is only half full, the File System is the one full.
These are my partitions. No idea what half of them do, but they are there.
So I'm dual booting Mint and Windows 10, and initially I gave my Linux partition 100GB of space, but now I kind of used it all and I started searching online to see if I could just extend it by shrinking my Windows partition and just adding the extra space, but apparently that breaks everything...