Chase or Capital One or Apple Credit Card and Savings for broken college student

Hi everybody,
I am looking for a new Credit Card and a new Savings Account.

I am currently use a debit card from chase, and Credit card from Discover It.

But somehow I don't like the system of Discover, it has been >6months and I still don't see my credit, and also it is too slow, harder for me to manage it somehow. I think I will need to work on this problem, but anyway.

I am looking for a no annual fee credit card that has good % for cashback and good for students. I mainly spend on gas and grocery.

And in the near future I will go to college, stay at dorm maybe, but my spend might be just gas and grocery so probably don't need anything like travel bonus.

Should I keep the Discover It, and open a Savings Account, or should I open a new Credit Card like Apple and its Savings account, or maybe Capital one? Cuz I heard they have good % cashback and around 3.50% APY.
I kinda like anything that is minimalist and easy to manage, and Apple really makes me wanna go for it, but I don't know if it worth it and fits my situation.