Could you tell me what are good low-fat foods that contain high protein?

Depends: If you eat dairy products you can try greek yogurt or cottage cheese (otherwise soy/almond/coconut yogurt). Non dairy sources include chia seeds, beans, lentils, quinoa, eggs, artichokes, broccoli, avocado, asparagus, tofu, peas, spinach, beet greens, peanuts, pistachios, sesame seeds, garbanzo beans.

Lean proteins.: Focus on fish, pork, turkey, egg whites and protein - the real thing, not cold cuts or canned meats. And grill or bake or broil - no frying. If you don't eat meat, beans and soy are great but you need to learn how to combine them to make complete proteins for proper absorption.