Sounds like my nutritionist. Except she gives me plate pictures with half the plate non starchy vegetables, 1/4 plate protein and the remaining 1/4 carbs like potatoes, pasta and rice. That should be every meal.
You should invest in a food weight scale on Amazon. Measuring everything exactly is really helpful. Once you get to learn serving sizes, you can just eyeball it. My surprise was the carb count in sauces and dressings. Those have a ludicrous amount of sugar. A serving of regular ketchup is literally about a tablespoon.