This is an essential skill when you’re the parent of a 3-year-old who thinks it’s hilarious to unravel the entire toilet paper roll, stuff it all into the bowl and repeatedly flush.
First, grab a plunger. But before you actually take the plunge, make sure there’s enough water in the bowl to cover the rubber top of the plunger. If there isn’t, DON’T FLUSH. That will cause the toilet to overflow, and you’ll have a mess on your hands (and feet). Instead, put some water from the tub or sink in a bucket and use that to fill the bowl. Place the plunger over the drain and push down, inverting the rubber cap against the bottom of the toilet. When you release the plunger, it will create a vacuum and suck up air and water with it. If a single plunge doesn’t work, try again (and again).
If this doesn’t fix your problem, you might need to pick up an auger (also known as a “toilet snake”). Or just call a professional plumber.