What does your current diet look like, activity level, and foods you enjoy? One of the easiest is "if it fits your macros" basically break you diet down to %protein, %fat, %carbs. This will be based on your current weight, activity level, and goals.

It's definitely not perfect and there are valid criticisms but I think it's a decent starter to get used to eating in moderation with specific goals in mind. I've done it with decent success, bf decreased while lifts went up/stayed the same.