Designing Cables

So I’ve done lots of cables now and I understand most of how they work, but the ones I don’t get are the ones that have some purls and some knits in the actual cable… does anyone know of a website or book that helps explain what different things does in the way of design?

Thanks so much!

I don’t know of a specific website, but there are a lot of books on knitting cables. Here are a few, but if you go to Amazon and type in ‘knitting cables’ you’ll see a bunch. I suggest trying your library, too.