Student or Learner
Could you please recommend a web site on which a student could find good and casual reading?
If you want books, then Gutenberg, books.Google and The Online Books Page all provide full text. Note that these will be books that are out of copyright, so rarely younger than 50 years old.
For younger readers, this is a good site to try: Read Children's eBooks Online
There are online versions of many newspapers and periodicals - just search for the title of the publication followed by "on line"