If you'd like to keep today's leftovers for later or another day, then it's best to leave them to cool, close tightly with a lid and put away in the fridge.
Cooked dishes need to be stored in the fridge because the low temperatures prevent the growth and development of harmful microorganisms in your food. Consumption of food containing microorganisms and bacteria can cause stomach problems and intestinal diseases.
After putting them away in the fridge, all dishes have an expiration date - you shouldn't eat them 2 days or later after putting them in. This doesn't apply to dishes with rice, which need to be eaten within 1 day after being put in the fridge because rice is a lot more vulnerable to the negative effects of bacteria.
It's also important to know that food leftovers shouldn't be reheated more than once. If you were unable to finish everything you heated up, it's best to throw it away.
If you don't wish to consume a given product or dish at the moment, you can freeze it. But it's very important to keep in mind that it must not be past its expiration date upon the moment of freezing.
If you thaw or reheat products or dishes you had previously frozen, don't refreeze them. An easy way to avoid problems is to freeze the products in small portions. Instead of thawing everything and then being forced to throw away any leftovers, it's better to thaw just 1-2 small portions - as much as you actually need.
It's extremely important to read the labels, which are there to show exactly how long and how you can store certain things and what you shouldn't store.
Also be aware of how you arrange the products in the fridge. Mixing cooked food with raw ingredients, such as various meats and fish, as well as dairy products, can cause them to spoil. Consumption of them in turn can cause stomach problems.