Ray recommendations are driven by the interests you’ve selected, what you choose to watch, set reminders for, and search. After a few days of use Ray begins to learn more about you and it never stops - the more you watch, search for and rate content the better the recommendations become.
For example: if you tend to watch a lot of Suspense movies, Ray will start to highlight those over time. And if you take the time to show Ray you like or dislike specific sorts of things that will more directly impact what you see recommended going forward.
You can be deliberate about telling Ray what you like and dislike by accessing the detail screen of any TV programs. You can tell Ray that you like or dislike it by tapping the thumbs up and thumbs down icons at the top right.