I like Pandora because it's simple. Ironically it's Apple that has the reputation for making simple things, but Apple Music is a maze. It has this heart butto

I like Pandora because it's simple. Ironically it's Apple that has the reputation for making simple things, but Apple Music is a maze. It has this heart button as well as star ratings. What's the difference? What effect do they have? Why do I still have this "iTunes Store" and this "Music" on my phone? I can't buy songs through the "Music"? With Pandora I hit thumbs up if I like it, thumbs down if I don't. Simple.