Figure 2.7 - Copies in the X-axis

Using the SHIFT+D keys gives you a lot of freedom to create all kinds of

copies based on the type of selection you have in Blender. For instance,

you can start making multiple copies from a selection of various objects

at the same time.

There is also another option for duplicating objects called Linked

Duplicate. By making a linked copy, you make an instance of your

selected object. Any changes applied to one object propagates to all

copies. Use the ALT+D to create a linked copy.

To unlink any duplicates created with the ALT+D, use the Object →

Relations → Make Single User → Object & Data menu. Select the

copied object and use that menu option.

Info: For some operations, you might want to create a copy of an object

that is in the same location as your original selection. By pressing the

ESC key after SHIFT+D, you create the duplicate but cancel the move