Effect of Element quality, Aspect Ratio, and Skewness on solution and results?

Hello there. We all know the specified ranges for the element quality, aspect ratio, orthagonal quality and skewness for the mesh elements, to be classified as good elements for modelling. But how will a low quality element, or with high skewness and aspect ratio affect my results? What is the background of it? How will a 'bad element' will cause the stresses within my model at that location to become illogical and absurd? What is the theory? How can they result in stress singularities as well?

Will bad elements also cause the displacements at those locations to be affected as well?

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