In this tutorial we will learn how to connect one object to another or a group of objects to another. This called "Parenting".
1) Make sure you have two or more objects selected.
2) Hit CTRL + P
3) Select "Make Parent"
(Note) The center of the chosen Parent is now connected to the center of the children with a dashed line.
(Note) If you scale, rotate, or move any of the children or their parents you will do the same to all in the group.
SHIFT-G Group Selection menu
*Children - Selects all the active objects' children, and the children's children, up to the last generation.
*Immediate Children - Selects all the active objects' children only
*Parent - Selects the parent of the active object.
*Objects on shared layers - It selects all objects on the same layer of the selected object.
ALT + O moves the child to it's parent
ALT + P (Clear Parent) - Separates Parent from child
ALT + P Clear parent and keep transform (Clear track) - Separates the children from the parent and returns them both to their original location, rotation, and scale.
ALT + P Clear parent inverse -