In "Adding multiple profiles to our Portfolio _ Portfolio Website + Blog Using Sanity.io #11," viewers learn how to incorporate multiple profiles into their portfolio website using Sanity.io. The tutorial guides viewers through the process of creating and managing different profiles, such as team members or collaborators, within the Sanity.io backend. It demonstrates how to structure the data for each profile, including details such as name, role, bio, and image. Additionally, viewers are shown how to integrate these profiles into the website's frontend, ensuring a cohesive and professional presentation. By following along, viewers can expand the functionality of their portfolio website, making it more comprehensive and visually appealing by showcasing multiple profiles effectively.