Is there any wide sense but introductory Book series/websites for mathematics literature? (just to be familiar with)

Luckily for you, one such book was compiled fairly recently: The Princeton Companion to Mathematics.

The first part of the book contains an overview of modern pure mathematics which should allow you to hit the ground running. The third part contains a survey of 99 important mathematical concepts, and the fourth part contains longer surveys of 26 major branches of mathematics. There are copious cross references indicating how different branches and different concepts cross-pollinate.

You can see the table of contents here yourself.

Added later: actually, a second such book has also been compiled: The Princeton Companion to Applied Mathematics. It's of a similar layout to the "pure" Companion but covers very different topics. Some more information on the book, including a pdf of the table of contents, is provided at the linked webpage.

OK, I do a search and sth found (mostly as Joshua said from available from Wikipedia reference part).

Encyclopedia of Mathematics This is good website but search based and a bit far from what i wanted but quite handy. I don't know how much it is comprehensive in the matter of subjects and how much efficient in showing the relation,...

HyperMath Far from what I needed, it's quite basic and incomplete.

FreeScience This is collection of free resources. Nothing more!

The Math ATLAS Pretty close to what I need but seems incomplete and obsolete. The good thing about this website is it has classified the literature pretty close to what I need. The best classification approach. It also cite some text and references for each topic which is cool. but I need a book/website with discussing the topics (pretty concise), make a relation with other topics and a bit uptodate.

Online Mathematics Textbooks this also provides some free books on different subjects.

Tricki Tries to collect different problem solving approaches! It also have concise desecration of each topic. pretty incomplete.... How much successful? I don't know. (here is the site's map)

PlanetMath To me not a good choice...I didn't like its topic classification approach either (here)

Math Structure a comprehensive list of mathematical structures. Beautiful idea! (Abstract Algebra)

Wolfram Pretty basic and totally fragmented.