This page describes installation using live images. If you are reading this, you are expected to have a computer supported by the live images, and to have acknowledged that Chimera is not production-ready yet.
Picking the right image
Every ISO image comes in two flavors. You have the base image, and the desktop image.
Base images are fully bootable. However, they only come with a small set of packages and therefore only provide a console environment. You should use base images if you want complete control over what your final system will be like, but such setups also require more knowledge.
Desktop images come with a full graphical environment. The official desktop for Chimera is GNOME. There are other graphical environments available in the repositories.
If you want a GNOME setup, you will want to use a desktop image. It comes with a more complete environment including a web browser and other basic software.
Desktop images by default boot into a Wayland environment. There is a separate bootloader option if that does not work for you for some reason.