I'm a new cook and one of the dilemmas new cook face is going by recipes, having lots of leftovers, not using ingredients before their food storage expires. I have been using the Internet frequently for advice on food storage life and was wondering the accuracy of these sources. For example, I have mayonnaise in the fridge for 6 months now..Although it has not grown moldy, I don't know if it's safe to use for cooking. All sites I've visited said 2 months, one had up to 4 months. So when in doubt, does it prove true to "throw it out"? Now I've learned to cook with ingredients I have on hand before trying a new recipes that call for even more ingredients I may forget about or have no use for... Thanks.