I haven't been able to find any tutorials myself but I honestly don't think you need one. pi.fyi is centered around two functions, recommending media and asking for recommendations and that's really about it. you can recommend media by using the share button and you can ask questions by using the ask button. you can really recommend/ask just about anything. you can browse what other people are recommending or asking and answer questions with your own recommendations. but the way I learned to use this app was to just explore and try different things out. hope this helped!