Just tell me which fat/oils to buy and what to use on which food.

Im a 24 year old dumb guy, newbie to cooking everyday and living on my own... Somebody just tell me what to buy. I just want the highest quality whatever ...I literally eat eggs, steak and chicken ... and fruit and veggies but dont need fat or oil for those .. what do I buy for the meat and eggs?

Breakfast- scrambled eggs Dinner- chicken thighs sometimes breasts , or Steak, maybe lamb chops of I'm feeling creative ..

I'll buy whatever you guys tell me lol. Im researching stuff to the point of confusion and anxiety here ... I'll spend the money knowing it's high quality stuff or brands . I just don't wanna have to research and watch videos confusing myself anymore. What quality brands do I buy and what fat/oil for which food?