It is really easy cooking for one...the trick is to find a local meat cutting shop
from which you can buy just the amount you need such as, one pork chop, one chicken breast, one small steak. But really, if you are cooking for one, you may as well cook two and have it the next night or freeze for another meal. Potatoes and rice are great, because again, you can make just enough for you. Add a lot of fresh veggies and fruits to your rotation and summer is the perfect time to start practicing. Salads that include protein rich beans are good too and you can buy small cans of beans such as kidney, garbanzo, etc, for your salads or bean dishes. One chicken breast , or thigh mixed with kidney beans, lettuce, avocado and fresh tomatoes, and salsa makes great tacos, or burritos.
You can pretty much eat what you want since you are not worrying about another person....eat what you feel like eating, breakfast for dinner, dinner for breakfast! Keep lunches simple....fresh peaches over cottage cheese, or a great fruit salad. A plate of cheese and crackers with assorted fruit, that type of thing. Keep it simple to start with and as your progress, you will get more creative.
Pasta is really easy for one, also. Rao's Marinara sauce is an excellent prepared red sauce to use on pasta, chicken, and veggies. I add it to scrambled eggs for a really special dish and put it over a good slice of crusty bread that is toasted and buttered. A sprinkle of parmesan and it makes a great dish. You can add it to browned chicken and onions and cook slowly, put over noodles, or other pastas for a quick dish.
Do you have a good Farmer's Market where you live? Many have prepared frozen food made in their own homes. We have an Italian guy who brings his home made sausages which have no chemicals, just real food and they are to die for. He also has prepared (for two) lasagna, chicken alfredo, meatballs and spaghetti that are excellent. I keep a few in my freezer for lazy days when I don't want to cook. Check out Trader Joe's if you have one, they have some excellent products too, but you have to experiment to find them. Their eggplant parmesan in the prepared foods section is excellent. Their frozen beef tamales are decent, with a favorite hot sauce. I understand their fried rice options are good.