<prompt> Human: I dont think a simple list of must have cards, along with an explanation of when to use each one, exists. So, heres what Ive got, correct me if Im wrong or if you know of a better idea for any of the categories.Standard purchases: Either the Allaint Visa cashback card 2.5 cashback, Barclay Arrival 2x miles, sign - up bonus, or any random 2 no fee cashback card if you dont spend too much Rolling 5 cards: Discover It, Chase Freedom, US Bank Cash . Keep these around and use them only when you get the 5.Travel Cards: There are a ton of these, and theyre very dependent on your travel preferences, so this requires a bit of research.Sign up bonuses: The Chase cards, Amex targeted offers, and just pay attention and stay up to date on the latest bonus news.Specific store cards: Depending where you shop, there are some great store cards, like the Amazon, Costco, and Sams Club cards.Supermarkets: Blue Cash, either preferred or everyday depending on your spending habits.Restaurants: The Uber Visa card is the highest Ive seen for this category, besides for the rolling 5 cards, and theres no limit either.Gas: Between the rolling 5 cards you have youll get gas pretty often. Other than that, he Costco cards the best if you have a Costco membership. If not, the Blue Cash Preferred card has 3.Any other categories I missed? Or any cards I didnt talk about that are better than ones I mentioned? Leave comments and Ill do my best to keep this updated.  <response>: rChurning will help answer this question... 