Here are the main parts of the official GIMP website.
www.gimp.org is the official GIMP site. If you know only one site, it must be this one, especially because it contains links to many other important sites. On the front page, you’ll find news about the latest releases and links to pages where you can download them. The rest of the site contains the major pages mentioned in this section.
wiki.gimp.org is the GIMP Developer wiki, a collaborative website about GIMP. It’s intended for developers but helpful to anyone who wants to know about developers’ projects.
bugs.gimp.org is a somewhat esoteric page. It does not explain how to report bugs, but only enumerates the current list of bugs in various versions of GIMP. This page ...