Look at actual recipes. I just think of actual meals that we will have that week and check what ingredients I need so;
Roast dinner - chicken, potatoes, peas, thyme, lemon
Mushroom risotto - risotto rice, veg stock, onions, garlic, mushrooms, Parmesan
Bolognese - mince, onions, garlic, tinned tomatoes, courgette, carrot, herbs, spaghetti
Etc
I use bbcgoodfood, Jamie Oliver and delia websites for recipes.
Do this for lunches and breakfast too.
Have staples in the house like bread, butter, cheese, salt, pepper, oil, spices, eggs, tea, coffee, sugar
Have some things in the freezer too for days when you can’t cook or don’t feel up to it.