Blender how to align all vertices and how to auto smooth

[@Trapbzy]

say i make a half circle out of vertices, but the half circle isnt smooth and even is tthere a way to achieve that?

[@zaelu]

why on my blender 3.12 I have to press S then start dragging from outer circle (not inner) then press Z then 0 and then enter?

[@projectlara8637]

Ture😁, it's kind of a hassle. However it's also super useful.