How to properly vent a bathroom to prevent moisture buildup and maintain good air quality?

To properly vent a bathroom and prevent moisture buildup while maintaining good air quality, install a ventilation fan that is appropriately sized for the room. Run the fan during and after showers to remove excess moisture. Make sure the fan vents to the outside, not into the attic or another enclosed space. Additionally, keep the bathroom door open when possible to allow for better air circulation.