The answer to 'how to fix toilet' is to first identify the problem. Common toilet issues include a clogged toilet, a leaky toilet, or a malfunctioning flushing mechanism. Once you've identified the issue, you can take steps to fix it, such as plunging the toilet, replacing the flapper, or adjusting the water level. If the problem persists or you're not comfortable making the repair yourself, it's best to call a professional plumber.
When fixing a toilet, be sure to turn off the water supply first and wear rubber gloves for protection. Also, have the necessary tools on hand, such as a plunger, a toilet brush, and a wrench. If you're unsure about any part of the repair process, it's always better to err on the side of caution and call in a professional.