Shortcut keys review: [HOLD Select and click vertices] - Selecting multiples vertices or deselect if clicked again [DELETE or X] - Show the delete menu to delete vertices, faces, or edges
Then try changing the iterations, Screw value, and Axis to edit how this screw will look!
Note: What does "iterations" mean?
Think of it as a loop, how many loops means how many iterations.
If I say one count loop is "1,2,3", then two loops will be "1,2,3,1,2,3".
So then 3 iterations(3 loops) will be "1,2,3,1,2,3,1,2,3"