 The study provides an overview of permanent supportive housing, PSH, and rapid rehousing, RAH, studies for youth, 18 to 24 years, experiencing homelessness, YH, summarizes their utility, and reviews the team's current and past randomized trials testing RAH with YH. The study highlights the need for fidelity to housing first principles, randomized design, and focus on youth in future research efforts to guide best practices for ending homelessness and addressing drug use and mental health problems among YH.