The most common reason for a toilet to continue to run is a problem with either the flapper or the entire flush valve itself. The water is slowly draining so the fill valve keeps running.
The flapper is the least expensive and easiest solution, so start their. It's usually around $5. If that doesn't solve the problem, I would purchase a flush valve kit, around $20, and replace your flush valve.
*Note: If you have to replace the flush valve, you have to take your toilet apart. Start with the flapper.
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