I am trying to follow the Teacup tutorial by Blender Guru. I have made my cup and it's handle and I am trying to bridge the edge loops to merge the other part of the handle back into the cup. However a new face gets generated, which looks like a sharp plane. I have tried deleting the face, and changing the sizes of the edge loops, but I am unable to get a clean handle merger. Adding a face by selecting 2 vertices on each side leads to similar problems.
You need to make the edge loop of the handle a face. In the tutorial, he grabs the two faces and then bridges the edge loops. Your model does not have a face at the end of the teacup handle.
You can fix this by selecting the four edges at the end of the handle (
alt-click to select the loop), and press
F to create a face.
Then, go into face select mode and select the two faces you want to bridge. Then press
CTRL + E and select "Bridge Edge Loop".