Sometimes when we arrive home, we are so tired and hungry and I am at a loss in terms of what to make. Often, I just want to mix all the things in the refrigerator and boil them or fry them and mix with spice and lemon. Without concerning answers too much with the taste or anything, I'm most interested in MacGuyvering dinner without also ending up with food poinsoning.
What are the major, bold-faced beginner guidelines I should follow to ensure the safety of doing this?