Which views are the most important for a dba admin?

Hi I am new to oracle, and I am wondering which views are the most important to monitore.
Can someone give me a usefull link?
I know the views depend of wich kind of information you wanna retrieve.
But I think about space left on tablespaces, segment information, backup information, status of the database.....
So any help would be appreciated.For example I am wonering which views would an admin taking a new job and database would look?

I would recommend you (if not already done):
- first read the Concepts manual:
http://download-uk.oracle.com/docs/cd/B19306_01/server.102/b14220/toc.htm
- then the Administration Guide:
http://download-uk.oracle.com/docs/cd/B19306_01/server.102/b14231/toc.htm
At the end of each chapter of this document, there is a section named "Viewing Information About ..." such as http://download-uk.oracle.com/docs/cd/B19306_01/server.102/b14231/create.htm#sthref482
that contains the related views.

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