Roughness at Modeling

Hello guys,at the images you can see roughness in bottom of glass an the cups. How can I solve that ?




Thanks in advance.

The end cap on cylinders is a fan, not a single face, many ways of fixing it, simple way is to select the face and press “I” for insert, just needs another ring or 2 of control vertices to define surface.

easiest way to deal with it: delete the central vertex, select the exposed edge loop, extrude and scale inward, extrude again and use alt M to weld at center.