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Planes and axes

The Construct tools make reference geometry. It builds no solid, but it gives you somewhere to sketch or something to cut or spin around.

A block with an offset plane above it and a vertical datum axis

Offset Plane (O) is the one to know. Click a plane or flat face, drag the arrow or type a distance, and a sketch opens on the new plane.

Datum Plane adds rings that tilt the plane. Midplane sits halfway between two faces, and Plane, 3 Pts goes through three points. Datum Point and Datum Axis give you something to snap or revolve around, and Axis on Edge follows a straight edge.