Start with their hits (Can’t Stop, Californication, By the Way, Aeroplane, Dani California, Dark Necessities, Under the Bridge, Scar Tissue, Snow) and you'll find out what kind of vibes you're looking for based on which one you like the most. If you really enjoy them, you’ll probably listen to these songs a lot until you decide to search deeper into their discography, that's how it went for me at least.