Reheating food is thrifty and yummy, and with this infographic, you can make sure that you're getting the basics right.
Food poisoning is no fun! Don't be cavalier about tossing stuff in the fridge after it's been sat on the counter for two days, or into the microwave after it's been in the fridge for two weeks. However, saving your food for later will save you time and money, so it's worth taking a minute to do it right. If you're cooking or ordering large portioned meals (coughUSAcough) then the chances that you'll have leftovers fairly high, and hey you paid for that food so you should get to eat it later.
Reheating pizza by frying it in a pan is the smartest thing you'll ever do. In my experience, it is even more delicious than when it was fresh. The microwave might be fast, but if the food you're reheating has any bread or bread-like substance with it, do yourself a favor and take the time to use the oven, it will significantly increase the yum factor by decreasing the sog factor.
If you don't have any leftovers to properly preserve, don't worry. Our Ultimate Slow Cooker Guide will get you started.