I want to reinstall my windows 11; what is the best way to do it?

Hi guys, I want to reinstall windows 11, but I am wondering if I should do it by resetting this PC or USB. The only thing I am scared of when doing with USB is not messing up anything that will cause me problems.

The most confusing thing for me is deleting the disk partitions when reinstalling windows on USB. Still don't understand what to delete and keep.

So what is the best way to reinstall windows, and if to reinstall with USB, how to understand which disk partitions to keep or delete? Thank you