Not able to apply the most simple screw modifier possible Add curve
Rotate as displayed in picture below
Add screw modifier

Tried other axis, got a dome instead of a ring
I want the result on the left but got the one on the right instead.

https://youtu.be/gbNo0odrSVg?t=31
The axis of the screw modifier is set to Y in the first example, but it’s set to Z in the second example. Change this, and everything should be fine.