It's common for toilets to get clogged with regular use. The most common way to unblock a toilet is to use a toilet plunger. A toilet plunger works by forcing water against the blockage, using pressure to push the offending debris through the u-trap freeing the water flow. Plungers are often all its takes to unblock and get a toilet working again.
When beginning this repair, make sure there is adequate water present in the toilet's bowl. Plungers work by pushing water, so in certain situations, water will need to be added to the bowl before you start plunging. Insert the toilet plunger into the bowl of the toilet. Seat the plunger around the drain of the bowl, making a close seal, which is important to maximize water pressure. Rapidly depress the plunger around 12 times forcing water against the blockage. Unless the blockage is severe this technique will break up whatever is caught in the toilet's u-trap.
Please watch this video for help and follow the instructions: https://www.youtube.com/watch?v=KGndCGSEVwQ&ab_channel=HomeownerSeries