What meals do you know which aren't too time consuming to prepare (or if they are last for a very long time), are cheap and whose ingredients are easy to acquire?
Bonus if it isn't just mainly carbon-hydrates and if the ingredients don't need to be used immediately (unless the meal itself when done can last for many days).
Simple pasta dishes like pesto or carbonara are my go-to when I’m in a hurry, cooking time is limited by how quickly you can bring the water to a boil and then 10 min for the pasta to cook.
As for pasta sauces, ragù is a bit time consuming (but most of the time you’re not actively cooking, just letting the pot simmer) but if you make a big batch you can put them in jars and freeze them and bam, free to use ragù anytime you want!