It is awesome to work with the latest tools like CSS3 and to get the most out your web-projects. Despite to think of all the possibilites you have now and what you can do, it is always good to think carefully about where and when to use them. In order to make yourself comfortable with its usage, take a closer look at this article on CSS3 Best Practices for designers. It will tell you how to use CSS3 correctly and when should leave it out.