Whenever I use the fill tool on the back I get this weird slanted thing that overlaps, and it's all one face so I can't delete it without deleting the whole backside. How do I fix or delete it?
If you get a weird result when using the Fill, it is usually (and in your case) a matter of a wrong Selection.
Also check for so-called Double Vertices (M > Merge > By Distance).
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Omar Domenech
replied
I think maybe you are filling a way too big Ngon, try selecting more isolated vertices to make smaller faces, like you did on the front. It's a bit hard to explain by text since it's a modeling principle. For the moment try doing exactly what you see on screen, Press Start is an introductory course, it's not super beginner or a fundamentals, you can watch concepts and know how's on the Mesh Modeling Bootcamp.
