To install Windows 11 you need your Windows 10 to boot in UEFI mode.
And to boot in UEFI mode you need your boot drive to be formatted in GPT.
And to format drive to GPT you need a few hundred megabytes of unallocated space. So I had to shrink my system partition as well.
Windows 11 installs tons of junk. Facebook, Spotify, Instagram, you name it.
Also, they screwed search. Again. It will search Internet, but won’t find local files.
By the time I finished installing Windows 11, I already forgot why I wanted it in the first place.