Painting - painting kitchen cupboards

This might be a no brainer but maybe there's a small hint that might be useful.

I'm painting our kitchen cupboards.

I've done this a couple times in the past and always end up with a small drip line on the edge of some doors. I take the doors off the walls, paint them flat..two coats each side.

Am I puting too much paint on the brush? should I use a roler? Is there a type of brush that's best for a door? should i paint the edges first, then the flat side or the reverse?

Any hints appreciated.

When I paint anything flat, I use a damp rag to wipe the excess paint off the underhanging edge as I paint. Or I use my brush to smooth it out as I go. You may be applying the paint too heavy if you experience a lot of drips on the edges.

Thanks:

I was speaking yesterday to a friend who is a professional painter and he said much the same. He said not to worry about the drips but clean them up while the paint is wet. He also said he uses a damp cloth when doing fine edges of molding, windows,etc. Easier just to wipe a straight line than get to fussy with the painting (at least when using a latex paint)