As everybody knows, web is something where people look for information. Well if you want to become a good web programmer, get started by referring to W3Schools.
This is the best and a simple online web tutorial site, using which you would probably be able to design a good web User Interface. For beginners its a good site to start with. Simple presentation and precise explanation is given here. Not only for beginners, but also useful for any web programmer to design good web User interface.
Just click "W3Schools" for more information.