Simple Modeling question (fill tool)

Does anyone know how to fill that triangle (why the fill tool doesn’t work with vertices) at the moment i have to bridge the 2 vertices and then use the fill tool to create the polygon. is there a one step operation for this ?

also I am trying to fill the opening of that cylinder with an ngon but the fill tool create triangles then I have to use dissolve to make it an ngon. is there a one step operation ?

You are looking for Make Edge/Face (F).

just read the manual:

and this is not the right place for such questions: