Experienced users know that certain pages of the VASP manual PDF are worth printing or bookmarking:
Each tag comes with a description, allowed values, default settings, and often examples. vasp manual pdf
Once you have the PDF, understanding its structure will save you hours of frustration. A typical VASP manual PDF is organized as follows: Experienced users know that certain pages of the
Setting ISMEAR = -5 (tetrahedron method) for metals. Manual says: Tetrahedron method requires a dense k-point mesh and fails for partial occupancies. Use ISMEAR = 1 or 0 for metals. vasp manual pdf