What to do if the bottom of the pot is burnt?

The third method is to use baking soda or sodium bicarbonate to clean it!

Add some alkaline substances to the pot, such as baking soda, baking powder, or flour. These items have good cleaning and absorbent properties. Then pour in a small amount of white vinegar, enough to cover the burnt area. Bring to a boil, then let it sit for a while.

After about 10 minutes, the burnt stains will be effectively softened, making them easier to remove.