how does the dualboot thing work

[d a double d y]

OK so you shrink your c: partition then boot up in your kubuntu flash drive make a swap and efi partition and the root partition and boom but does it automaticly install grub / add a entry to the boot manager or when i boot up i wil be greeting with the windows boot manager or do i have to set that up myself (how do i do that) (also how do i get a home partition does that just come automaticly)

[jlittle]

(I'm assuming that the computer uses UEFI and that Windows has already set an EFI system partition aka ESP.)

Yes, grub is installed and there will be a Windows entry on the grub menu, which chains on to the Windows boot loader.

If you want to have a separate home partition you'd set that up. Now, if you don't know why you want a swap partition, you don't need it, *buntus create and use a swap file if the OS needs it. I suggest you consider using btrfs, in which case you'd make just one btrfs that takes up all the space; the installer will put /home in a separate subvolume.

Whatever your choices, I suggest setting up the partitions before starting the installer, from a live USB session, using the KDE partition manager. I find it less stressful that way, because I can muck around and undo mistakes, and I've become familiar with the partition manager, a useful skill. Then, when you run the installer, choose "Manual" and set the mount point for "/", and "/home" if you have it.