Delete Excess Geometry

Hi all, I’m new around here…

I’m not sure what to expect from a new forum and am hoping it will be okay to ask some potentially “nooby” questions once in a while. I am new(ish) to modeling with blender and was wondering should i be deleting the excess faces created by the corners of these walls. As is the 2 sides that cannot be seen by eye.

You can if you want to. Less faces when UV unwrapping.
BTW. You’ve got a problem with missing edges on the right side wall.