What’s next after discovery IT student card

I have been using my discovery IT student card for about 7-8 months since opening it and I’m wondering what card should I use next for my credit journey. I was thinking about the chase freedom flex, but after some review in this subreddit I’m rethinking that. (But if someone does recommend it with good reason I might get it)

FYI I don’t got much knowledge around credit card I just know that I should spend responsibly, on time at full balance.

Also I’m not sure if I can ask this but where can I get an high yield savings account. I’m using regions for checking and fidelity for investing but they either don’t have a HYSA or it’s not that good.