Vehicles, what do you put off and what do you hop on it right away repair wise?

On your vehicle what, if any, do you know that needs to be done but put off, and what do you jump right in and get repaired or replaced, such as, you might wait to recharge the A/C, but jump right on replacing a headlamp; or you will put off repairing a tailgate that is busted, but fix the leaky oil pan right away? If the vehicle is your main vehicle, does that make how quickly you upkeep or repair it more or equal to the secondary or spare vehicle?