Reply To: Should modifiers be added in "Edit Mode" or "Object mode"? I realize while practicing that it is available on both of them.

Here is a little more detail on this.
Modifiers can only be applied to objects, not to parts of objects that you may have selected in edit mode. In other words modifiers can only be applied in object mode (it’s possible to ‘add’ them in edit mode, but not to finalise or ‘apply’ them there).