How can I copy & paste?

This question is pretty basic, but I really can’t find it.
How can I copy an object or a series of vertices and paste in other place?
The Copy Attributes menu seems not what I need or at least I can’t figure out how to use it.

shift+D (duplicate) is what you are looking for. Then just drag object/vertices in desired location and press mouse button.

Thanks your reply, this is what I need in my first Blender work.