How do you potty train a 4 year old?

To potty train a 4-year-old, start by encouraging them to use the toilet regularly, such as after meals or before bed. Use positive reinforcement, like praise or small rewards, to motivate them when they successfully use the toilet. Make the process fun with colorful potty training books or songs, and ensure they feel comfortable and confident sitting on the toilet. Be patient and understanding, as accidents may happen; consistency and encouragement are key.