Like from having zero in cupboard?
Absolute basics: rice, onions, carrots, tinned tomatoes, stock cubes, salt, spices (start with pepper, paprika, cumin, turmeric, then branch out), porridge oats
Next things up: lentils/chickpeas/beans etc, milk, pasta, potatoes, gravy granules, chilli, bread, vinegar, cereal
Then start adding whatever veg, spices, flavourings etc you can, also cheese, eggs (if you eat them) then meat last.
Speaking from experience of building up from absolutely nothing and next to no money.