Muscular strength is how much you can lift/push/pull, ect. Muscular endurance is how long you can do something with your muscles. Like if you have to put your are straight out in front of you and hold a 25 pound dumbbell. Your will get tired and give out. the more Muscular endurance you have the longer you can do something with your muscles.
If i’m not wrong the main macronutrients are fats carbs and protein, i don’t know if that’s for teens but those are the main macros
C. Nutrients that strengthen bones and teeth, help keep blood healthy and keep the heart and other organs working properly