This is really good practice. To the ideas below, you add a salad and a vegetable and have a really nice meal.
I use the oven for easiest dinners, here are some favorites:
Meatloaf with scalloped potatoes or baked potatoes and baked apples
Roast chicken with baked rice and broiled tomatoes- ice cream for dessert
Baked spare ribs with baked sweet potatoes with dump cake
Pizza
The second easiest is with the crock pot or slow cooker, throw it in on low before you leave for school, or high for 4 hours after you get home, for a later dinner.
Many things that require some attention if cooked on the stove top, like stew or chili, are very easy and require less attention if cooked covered in the oven.
Also it is more fun to cook, if you cook the foods you like, so what do you like?
Don't know how many people you are cooking for?
