Do you mean basic obedience? I don't know there is a good website. I always sugggest a class or book. The younger the better. With somebody the right age in the family, 4-H dog training is a great idea.
In my area, clubs form soon after the first of the year. Even many urban
areas have 4-H. For info look in your phone book under government listings
for extension or cooperative extension offices. Ask specifically about a dog
or canine club. The dogs see all the people and dogs in the household as a
pack with each having their own rank in the pack and a top dog. Life is much
easier if the 2 legged pack members outrank the 4 legged ones. You can learn
to play the role of top dog by reading some books or going to a good obedience
class. A good obedience class or book is about you being top dog, not about rewarding standard commands a treat. Start at
Raising Your Dog with the Monks of New Skete