How and what to get started?

Hi everyone first time posting to this sub, I’m a 22 year old male and I’m 230 pounds at 6’3”

I was looking to start going to the gym but I have no clue on what exercises or diet to do. I would like to loose weight and gain muscle. I heard about calorie deficits but don’t know how much or to track It

Any and all advice would be great