The easiest way to rotate objects is to select the objects, then click and move their rotation handle. You can also enter rotation values in the Inspector Bar.
Note: To rotate (or copy) objects relative to specific points or objects, see Assembling.
Tip: If you are using the 3D Selector, you can lock a rotation axis. Right-click on the rotation handle and select Lock Axis from the local menu. See 2D - 3D Selector.
Note: You can make a copy by clicking the rotation handle, pressing Ctrl, and then rotating.