CHAPTER 2. GETTING STARTED

In my opinion, there should be some reminder of the necessity of setting preview profile. For example at the end of "Before you can participate in this tutorial, you need to complete the installation of Red Hat Single ....." there should be something like "Also do not forget to set the preview profile either by property -Dkeycloak.profile=preview or by adding profile.properties file to your configuration folder."

Also add this option to snippets below:

${KEYCLOAK_SERVER_DIR}/bin/standalone.sh -Djboss.socket.binding.port-offset=100 [-Dkeycloak.profile=preview]

And the same for windows command.