Feel free to register at other stores as well that are more to your preference in a wide variety of prices so that guests on a limited budget can buy something as well as guests with bottomless pockets.
Treat a registry like a wish list of stuff you want but would never spend your own money on. When you are out and about and see something that catches your eye that you want but can’t justify the expense, put it on the registry. Don’t expect that you will get $200 from a distant aunt to buy that frappe maker yourself when you can save a step by allowing her to purchase it for you. Guests WANT to buy you gifts that you want and need but they need your guidance. Some couples register, in addition to the standard list, for things associated with shared hobbies, entertaining guests, electronics, furniture, pet items, holiday decorations, and the list goes on. Some people don’t see the point in a physical registry and prefer cash, while older generations almost always will only purchase from a physical registry. If the couple doesn’t have a physical registry then they will receive countless personalized gifts they don’t want and can’t return. Many social circles do not default to cash only if there is no registry, so don’t automatically assume without asking your friends and families what their customs are.
You can add whatever you need to your registry! Typically, things that are for the couple rather than just one person, so I would avoid putting like a designer purse or men's shoes or jewelry or anything that would be used by only one person in the couple. Commonly, household items are on registries: dishes, bedding, towels, lamps, cookware, cutlery, blankets, storage bins, etc. However, you can also register for a honeymoon fund, house fund, camping gear, artwork, holiday decorations, etc. Cash registries are a "know your crowd" kind of thing. Some people are totally fine with cash registries, while others prefer to give a physical gift.
Since we have most of the stuff we need for our house (which is usually what they suggest for the registrys) I am putting things on it that we either have talked about getting because they would be nice to have but not necessary (like a really really nice set of pots and pitching the old ones or air purifiers for different rooms) or things that we both like to do (such as a new slightly larger tent for our camping trips or a really expensive board game since we both like games). I also added a link for a honeymoon fund since we will be postponing our honeymoon until 2024.
Add what you need or add what could use an upgrade. and if you don't have any of that, then just add things you'd simply want haha even gift cards are ok. some people even just opt for a honeymoon fund where people can purchase honeymoon activities for you, etc.