Bevels on the curve

Press K on the keyboard to bring out the knife tool. Cut across the plane from one vertex to another.

Nice edge established. 

Press #2 at the top of the keyboard, not on the Numpad. #2 refers to edge mode. For instance, #1 as vertex mode, #2 as edge mode, and #3 as face mode.

Select two opposing edges and press the X key to bring out the sub-menu. Go down to where it says "Dissolve Edge" to get rid of the edges completely without affecting triangular faces. What will happen if you accidentally delete edges? The triangular faces will be deleted along with the edges you selected a moment ago.

And violas! Problem solved.

Another method is to remove the middle vertex.
Select the middle vertex.

Press the V key to rip off the vertex to the desired location.


Select two opposing triangular faces and delete them.

Press #1 on the keyboard to go to vertex mode and select all four vertices. Press "F" key to filling in the face. Do the same to another sidea

@Vue .. Thanks! that worked! It also kind of opened my mind how to fix these issues! Such a simple solution, I was putting too much thought into it. Thanks again!!!

You're welcome. I'm in the same shoe as you're having when I first started Blender in 2019.