Welcome to The Break Room! I see that you already found our guide for cashiering - I'm glad it could be of use to you.
Red Cards are a huge focus throughout the company right now. As a cashier, you'll be expected to get guests to open a Red Card. There are a myriad of threads about Red Cards, so feel free to peruse them (type "Red Cards" in the search bar and check out the Similar Threads at the bottom). Obviously, very few guests will want to open one, so you'll want to develop an effective yet concise pitch. You don't have to be a salesman; just be knowledgeable about all the benefits. Your lane should have brochures that explain all the benefits - you can give these to guests to read or refer to them yourself.