Offset
Offset copies sketch geometry inward or outward by a distance: walls, clearances, margins and the inset pockets that follow an existing outline.
Fillet
A 2D fillet rounds the corner where two sketch edges meet: the edges are trimmed back and a tangent arc fills the gap.
Project
Project flattens 3D edges and faces onto the sketch plane. The projected curves are fixed reference geometry: the solver never moves them, they render as locked (green) geometry, and your sketch geometry can be constrained against them. It is how a feature follows the shape of what is already there.
Copy
Copy duplicates sketch geometry along one or two directions or around a centre point. The copies take part in the same face-building step as the rest of the sketch, so a copied circle is a hole like the original.
Mirror
Mirror reflects sketch geometry across a line or an axis. Draw one half of a symmetric profile, mirror it, and the two halves join into one region.
Guides
Guides are construction geometry: drawn and constrained like everything else, visible in the viewport, but left out of the profile when the sketch becomes a face. Use them for layout circles, centre lines, mirror lines and anything you constrain against but do not want extruded.