Lippy

Yep, you can delete your Windows partition once you no longer need it or any data within it. Then once you update your bootloader (usually GRUB, some distros do this automatically when updating the system), Windows will disappear from the boot options.

Then you can either create a new partition in its place to store data on, or extend an existing partition to fill the empty space.

I’d recommend also backing your data as a precaution in case something goes awry.

If you have a spare drive on your PC I’d recommend trialling Linux on that. With that setup, you will have it dual booted with your existing Windows installation. It should help with the transition since you can just boot into Windows if you still need it for anything. That will give you time to get accustomed to Linux while still having that Windows safety net for a while.

Also if you later find that Linux isn’t for you then it’s easy to undo that, since all you will need to do is boot into your Windows drive instead.

I went with that strategy when I made the jump 4 years ago, and later dropped Windows entirely when I built my new PC a few months later since I realised I didn’t need it at all.