You give the number of stars by each or click on no preference. And if you don’t know what these scents smell like e.g. chypre or fougere for instance (and who does?) , then there is a help button next to it which will describe the scent and give examples of perfumes.
The recommended perfumes are shown with a photo of the bottle and a breakdown of the ingredients in to top notes, the heart and the base.
You can load iPerfumer from the Apple store and oh did I mention the App is free.