Moving the 'center of the object' to the actual center...
61188
How to recenter an object's origin?
93457
Move meshes of several objects without affecting relative position
33550
How to move an ellipse
138694
3D manipulator to middle of selection
70988
How can an object move from point A to point B?
58887
How can I rotate an object based on another's offset to it?
51393
Moving points onto lines (~neighborhood)
100404
Angle subtended at the centre by a segment of a circle
124706
Get center of geometry of an object
31202
How to change the pivot point of scaling to the center of selected vertices in Blender 2.8?
26335
How exactly do objects move
130511
Move object in inches instead of feet?
80504
How to align an object so one of its faces are axis-aligned? (make an object upright for eg)
139607
Creating point to center of polyline?
85574
How do I align an image to centre?
97751
Center of a group ring?
59564
Centre of the circle