By Steven Scott on youtube.com
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In this step, you'll learn about duplicating an object and duplicating a linked object. Duplicating an object is as simple as pressing Shift + D, while duplicating a linked object can be done by pressing Alt + D or selecting Object > Duplicate Linked. When duplicating an object, the materials are copied as well, while when duplicating a linked object, the materials are not copied. This can be useful if you want to keep the same materials for multiple objects.