California People First is an organization that helps individuals learn about:

The correct answer focuses on the mission of California People First, which is dedicated to empowering individuals with developmental disabilities through education and advocacy. This organization specifically emphasizes self-advocacy, helping individuals understand their rights and the importance of speaking up for themselves. This empowerment is crucial for individuals to navigate society and advocate for their needs effectively.

The other options, while relevant in the broader context of supports and services for individuals with disabilities, do not align as closely with the core mission of California People First. The organization is not primarily a provider of legal counseling or representation, nor does it focus solely on services vendored by regional centers or person-centered planning. Instead, its main focus is equipping individuals with the skills and knowledge necessary to be proactive about their rights and to advocate for themselves in various situations.