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You don’t have to write the same CSS-code or (X)HTML-Markup over and over again. Whatever project you’re starting to work with, at some point you have to define classes and IDs you’ve already defined in your previous web-projects. To avoid unnecessary mistakes you might want to start not from a blank file, but from an almost “perfect” scratch . The latter might contain some basic definitions you’d write in your code anyway. However, once you’ve decided to create such a scratch, you need to make sure it is really bulletproof — besides, if the stylesheet also sets up optimal typographic rules and basic form styling you manage to kill two birds with one stone. And this is where CSS Frameworks and CSS Reset are becoming important.
Selectors are one of the most important aspects of CSS as they are used to "select" elements on an HTML page so that they can be styled. Find out more about selectors including the structure of rules, the document tree, types of selectors and their uses. There is also a step-by-step tutorial showing how selectors are used in the process of building a 3-column layout.