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I'm a beginner and I don't know what's going on. Some faces I've made look like two triangles glued together with different angles.

Removing doubles didn't do anything, nor flipping normals.

enter image description here

user70264
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  • You are dealing with non-planar geometry. You have a quad that is cannot be flat any more, given the position of its vertices. Basically you need more subdivisions and proper placement of the vertices for a quad. –  Mar 08 '19 at 19:41

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All faces (quads and n-gons) will be divided into triangles when they are rendered. Depending on the engine the solution for that triangulation will differ a bit. This is a normal thing. If you don't like how they are triangulated you will need to do it your self.

Jackdaw
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