When you first open Eclipse there is a Welcome page that contains a number of useful links to information sources. Follow the links to the information you are interested in, or click a link to open to the perspective that is most suitable for you.
If you do not want to do either of these, close the
Welcome page (by clicking the
Close button in the toolbar of the
Welcome page,
). You can always display the
Welcome page later by clicking
Help > Welcome.