What is CSS?
CSS is short name of Cascading Style Sheet, which is a simple mechanism for adding style into your web document. You can use CSS to add style like font color, background color, background image, page element position and many more in your web document. CSS is important if you want to create a valid HTML page.
What is the benefit of using CSS?
There is many benefits for using Cascading Style Sheet. CSS primary benefits is that all of your web document page is easy-handle. You can change every style in your page within changing the content if you design it with CSS. Secondly, you can clone a lot of page with same style while different content by using CSS. Just have an external CSS file for every page you want the style to do this.
Besides, you can also combine your Cascading Style Sheet with some simple javascript, which you can let your visitor to change your page theme easily, without changing any of your web content. Just having more than one stylesheet and a javascript content will do so.
Lastly, using CSS is also important for creating valid HTML, while creating valid HTML is important for Web 2.0, and for properly display on every browser.
What can I get here?
You can read the basic tutorial by clicking the page on the navigation menu on your left hand site, checking CSS tag list, or get more information from there.