At times, due to some other work/ distractions, we get about the food we've kept on the gas. It is only when we get the smell of burnt food, we realise our mistake. Now, I'll tell you two easy ways to clean the burnt pot/ pan.
Put the pot/ pan on the gas with equal parts of water and white vinegar enough to cover the burnt area. Once the water starts to boil, lower the gas, let it simmer for some time, you'll realise that the burnt parts are slowly coming out. At this time, take a ladle and push the burnt parts, it will all come out floating. Switch off, throw the water, now you can easily scurb as usual clean !
A second way is in case you don't have vinegar, put enough water to cover the burnt area, then cut a big onion, put slices in the water, let it simmer for about 5-6 minutes after it boils, you can now push the burnt part with a ladle easily. Once you've managed to get it all out, switch off the gas, throw the water, scrub as usual.
The best way to prevent food burning is to have the timer on. As you know once it rings, you're reminded about what you're cooking, even when you're attending to some other work.