Edline allows teachers to incorporate various online resources and activities into a single online classroom space. It enables posting documents, links, discussions, media, assignments, quizzes and tests that are automatically synced to the teacher's gradebook. Teachers can create folders to organize content, build interactive assignments for students to upload work, and conduct data analysis on assignments. The tutorial provides guidance on customizing the class homepage, adding different content types, and creating interactive assignments and assessments for students.