Following this great tutorial on Youtube on min: 36:50
Trying to extrude a loop cut to create a roof but it extrudes the line as plane not sure what I am missing, also the gizmo is missing.
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The problem is that in the tutorial he doesn't extrude, he just translates it. Instead of hitting E to extrude, just hit G to grab, then Z to limit it to the $Z$ axis.
Or you can always click the icon for Move, which is the third one down on the left, then use the vertical blue Z axis arrow to move those vertices.