Since you are asking in the Training and Certification forum, I presume that you when you say that you want to "know more about" Windows 8, you mean that you want to find out about training for Windows 8. A good place to start is the client training
pages at Microsoft Learning:
http://www.microsoft.com/learning/en/us/training/windows.aspx
There you will find links to the official training courses for Windows 8.