A lot of men don't experiment enough with meals. It's the best way to learn flavor and to have the richest tasting food. Yes, flavorful food is often very healthy. It's essential to have a lot of different spices in your pantry. You can replace your fresh herbs(thyme, rosemary, basil, bay leaf) every couple of weeks.
Fresh wild caught seafood. Salmon, Tuna mainly. Chicken thighs and ground beef can make so many different meals if you're creative.
Maybe it's a remnant of how I grew up but I still appreciate the canned stuff. Tuna, Salmon, Calamari. Even Chicken. You can make some good meals out of those if you're feeling lazy. Salmon croquettes, chicken salad, tuna burger, a quick seared calamari stir fry. But I would say definitely fresh is just better tasting.
Grains. I like Quinoa. Legumes like lentils are great to store. I used to think Quinoa was trash because it was bland but a simple onion ans garlic sauteed in a pot. Quinoa toasted and then use whatever stock you like or if not, water and season it with some of your favorite spices(garlic, onion, mushroom powder, etc).
Definitely gotta have eggs
Vegetables. spinach, peppers, tomatoes, onions, garlic. Sweet potatoes.
Mushrooms. I've made many interesting dishes with all different kinds. Oysters and King Oysters. You can stir fry em. Make em like fried chicken. Grill em.
Peanuts, almonds.
Any frozen fruits for smoothies. Strawberries, pineapple, blueberry. Love blackberries.