There are two types of pages in Page Builder: Lecture and Standard pages.
Lecture pages are for CTL-produced online lectures only and must be created by a CTL instructional designer. (The exception is when a Lecture page is imported into a course site.) If you need assistance on finding the instructional designer assigned to your course, please refer to this article.
Another feature of Lecture pages is that they can be auto-numbered on the schedule according to their position. Please refer to Schedule Builder: Event Options for more information.
Standard pages (previously known as Activity pages) can be used for any purpose other than CTL-produced online lectures. For example, a Standard page could contain information about an upcoming class meeting, instructions for a group project or research paper, or the Zoom session information for the course.
You can even have a Standard page with the title "Lecture," but it will not include CTL-produced online lectures.