Clouds and hazes form in nearly every type of planetary atmospheres. They fundamentally impact the atmospheric structure and spectra of exoplanets and even influence their habitability. Intensive observing efforts have generated an abundance of data on clouds and hazes in exoplanets but modeling expertise in the community has lagged. This school will focus on physical models for cloud and haze formation in planetary atmospheres in different radiation environments, and include reviews on exoplanet observations and laboratory studies.