How can I effectively treat and prevent brown spots on leaves of my houseplant?

To effectively treat and prevent brown spots on leaves of your houseplant, you can try adjusting the watering schedule to ensure the plant is not overwatered or underwatered. Additionally, make sure the plant is receiving the right amount of sunlight and humidity. You can also gently wipe the leaves with a damp cloth to remove any dust or debris that may be causing the spots. If the issue persists, consider using a fungicide or insecticide specifically designed for houseplants.