pavla writes:
Since the early days of Blender, the 3D cursor is a distinctive feature that has often puzzled new users. What is its purpose? How can it aid your creation process? CG Cookie discusses ten useful applications of the 3D cursor to speed up your workflow.
01: Use the 3D cursor location for adding objects in 3D space
The most basic use of the 3D cursor is to determine where a new object is positioned in Blender’s 3D space.By default, the cursor is located at the center of the 3D world, but by holding Shift and clicking the right mouse button anywhere in the 3D view, you can reposition the 3D cursor.
Once you add a 3D object using Shift + A, the new object will automatically be added to the current 3D cursor location.
If you rotate the view, the cursor will shift according to the current view plane when you Shift + RMB click, but the orientation of the objects remains the same: aligned to the world axes.
If you want to place the 3D cursor at an exact location (and/or rotation), head to the Sidebar panel’s View tab and adjust the 3D Cursor coordinates. If the Sidebar is not visible, press ‘N’ on your keyboard to toggle it on.