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There is nothing such as the best website to learn AutoCAD. nevertheless Autodesk has put together a simple step by step tutorial to help absolute beginners learn AutoCAD. Check Autodesk site.Apart from that, you can find some Basic AutoCAD tutorials on the internet, and remember google is your best friend.
http://www.mycadsite.com/tutorials/
youtube is good for free tutorial of autocad
www.lynda.com, knowledge.autodesk.com, www.cad-notes.com
http://www.autodesk.com/ is the best site
https://knowledge.autodesk.com/support
www.lynda.com for beginners and/or advanced users
https://www.youtube.com/user/learnautocad/videos
http://www.cadlearning.com/
http://www.mycadsite.com/tutorials/
Autodeske Dashboard, mycadsite.com
Defintely Youtube if you are looking for free tutorials. Also you have Lynda if your account guarantee a free access.