An ideal mesh is highly dependent upon the problem formulation and the model geometry. Formal criteria for mesh quality are too complicated for practical use. But in engineering, an aesthetic approach is usually good enough. QuickField has a built-in automatic mesh generator. The mesh density can be manually controlled at any number of chosen points.
Experts can manually adjust the mesh to obtain better results or avoid unnecessarily dense meshes.
But if you are a novice to FEA modeling, it is better to use automatic procedures. QuickField solvers are based on iterative algorithms. From another point of view - very dense meshes need more solution time for each iteration, even with QuickField solvers. The optimal mesh size depends upon the model geometry complexity, problem formulation and the accuracy needed. We provide some material properties in our libraries.