Have you searched this forum? I believe you will find there is no easy answer, as it depends on what you are testing. If it's a simple HTML website, you are probably checking content, links, graphics, etc. If it is a store-front, you are also going to test the purchasing of products, the contents of the database, etc. Try searching www.stickyminds.com for some useful articles. I'd also suggest purchasing a book on website testing.
To start with Web testing, i suggest u to first learn the concepts/basics of webserver/browser conceptss/SSL/etc.
then when u do web testing, basic stuff is to validate all the form fields in a JSP application. then u must do security/penetration testing on web apps........
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