You're majorly handicapping yourself in the US if you don't use credit at all- you'll get your credit score checked for apartments, home loans, utilities, even some job application background checks-- and the only way to build your credit score is to participate in the system. That's not even mentioning the fact that the financial system makes it extremely worth your while via points/cashback/bonuses/etc as well as the extra security you have from being able to put stuff on your credit card in a major emergency. It sucks and it shouldn't be this way but it is.
If you find a few recipies you really like and learn how to do them from memory, and then make them a lot, you learn lots of efficiencies and shortcuts that save a ton of time. Making stuff without a recipie at all is even faster.
People with more money than sense lol, there's never really a great reason to get Doordash or Uber Eats