This article is from the Go FAQ, by Morten PAHLE firstname.lastname@example.org with numerous contributions by others.
The rules of Go are very simple, and almost every beginners Go site
will list them.
There are several sites on the web which contain a more detailed
explanation of the rules:
Robert also posts a 'Rules FAQ' to the newsgroup which is aimed
especially at beginners
Jan VAN DER STEEN:
Mori's Go Page :
Interactively teaches some basics as well
Tel's go page:
Also provides fundamentals about connecting, attacking, etc.
The American Go Association has published a booklet introducing the
game of Go which is available for download in .pdf format:
The European Go Federation has published a series of booklets in all
main European languages, developing a simplified approach to rules,
oriented toward easy teaching. Contact the European Go Federation
through the address as given in section 2.2.