These are my current disk partitions.
/yedek is for some personal backup files. As you can see there is only Ubuntu on my PC. I will install Windows, too. Because of this I want to shrink
/dev/sda3 . It currently 546GB and I want to split it: 300GB for
/ and 246GB for Windows (NTFS) is OK for me.
I'm using GParted for the first time. How can I shrink
/? I don't want to lose any datas from Ubuntu.