u follow  this link  in this link there are lot of books  these are amazing materials use this

http://knrao.awardspace.com/

To start  you can see how sharepoint  is used and learn the end user stuff, more details here:
blogs.msdn.com/.../...or-sharepoint-2007-moss.aspx

Also check the following:
office.microsoft.com/.../HA101756051033.aspx

All said you need to practice SharePoint and also do hands on. Just search on http://bing.com or any other search engine for SharePoint learning and checkout some webcasts and vidoes that should help.

Thanks for the reply . I have few questions related to Sharepoint .

1. How does Sharepoint really work ??
2. Where does Sharepoint site store data on the server ??

SharePoint is built on ASP.Net and leverages .Net very heavily (its all manged code :) ).
SharePoint stores all its content in SQL Server database and this can't be changed (no other database support).

Also some of its artifacts are stored on the file system like dll, applications pages, etc.
You will get to know more and understand it once you start  development.