Learning guitar on the web.

Hi, I bought a guitar the other day and I was wondering if there is some site on the web that explain cleary to beginner how to play guitar.

I saw some web site that show guitar tab but I dont even know how to read them,I'm a beginner so....

You've already made the first step by registering at this forum. Guitartricks also has a great beginner section that you should look through.