I am very new to Netapp storage. I need some document/Student Guide to understand the basic concepts of the Netapp storage system architecture and Administration. Can someone help me please?
Have you looked at the NetApp University? You'll need a login, however there is alot of free WBT available, which is also mapped to what you want to learn, including a "New to NetApp", please see link: https://learningcenter.netapp.com/content/public/production/learning_maps/customer/lm_customer_t2.html
Have a strart there and you'll likely have some more specific questions.
Also, there is an ONTAP simulator available that you can use to help understand the concepts by putting them into practice, available here:
Sorry, forgot to mention you do indeed have the manuals...http://docs.netapp.com/ontap-9/index.jsp
I would start with the Introduction and concepts section (http://docs.netapp.com/ontap-9/topic/com.netapp.nav.ic/home.html?cp=1) and you do not need an account!