The video explains how to use Course Player, Harris Digital Learning’s primary platform for high school courses. It covers accessing courses, navigating through course parts and lessons, viewing the syllabus and grade breakdown, and tracking progress with visual indicators. The tutorial demonstrates how to work through lessons and assessments, use learning tools such as text-to-speech, note-taking, and printing, and manage learning objects and PDF resources. It also details assessment features, including multiple attempts, progress saving, and feedback review. Additional navigation tools and resources, such as messaging instructors and accessing help pages, are introduced to support students throughout their learning experience in Course Player.