Why can I see the camera gizmo in the 3D View but not the actual camera itself? I am new to Blender. The camera widget in my viewport only displays as a dot and yellow rectangle, while in the tutorials it has a pyramid shaped bounding box and arrow indicating which way is up. How do I correct this?
What you are seeing is the camera's gizmo, which only shows up when selecting the camera object.

To see the camera wire shape, enable Extras under Objects in the 3D Views Overlay options.



Make sure, camera visibility is on.