Creating Game Objects in the Editor
Method 1: Right-click in the Hierarchy window to get this dropdown:

Method 2: Click on the Add Component dropdown menu (it looks like a plus sign):

Method 3: Click on GameObject in the taskbar:

Method 4: Click the three-dot settings icon for the Inspector window, then hover over "GameObject":

Duplicate, Copy, and Paste
Shortcuts
Updating Game ObjectsDeleting and Disabling Objects in the EditorLast updated