In the summer:
Buy a variety of vegetables that are good raw, (zucchini, peppers, beans, tomatoes, carrots.. avoid iceberg lettuce, it is only water) and cut them into bit sized pieces. Add cubes of cheese, sprinkle with lemon juice or balsamic vinegar. Have the most wholemeally or rye-ish bread you can find on the side and eat.
In the winter:
Buy vegetables good for baking, potato, squashes, beets, onions, turnips, and bake them in the oven. Shake some herbs on them towards the end, and some grated cheese towards the end and eat.
If you don't have any idea what you're doing start with basic foods and get into the flavours and textures and familiarize yourself with them. A meal doesn't always have to be something with a name and a sauce.
Also if you don't have one buy a slow cooker for the winter months. You can't fail with them and it will make a lot of food.