When looking for help or tutorials, on these arrangers it’s better to be specific. There are so many features and possibilities on these keyboards, that you really have to narrow it to get help eg I am looking for information on how to set up registrations, or how to create styles, or how to record etc. Even better, try to do what you want, then post here where you are getting stuck. Eg I am trying to record a song but when I try to play it back the file is empty? This way you likely will get quick help and make progress.
It is tempting to just think I want to learn everything about them but it doesn’t work well like that. Master basic functions, then move on to other things. The knowledge will build.
Mike