The Linux Foundation has created all of the content for the course, including the videos, written text, activities, and labs. It's clear to me that their content team has made an effort to space out the videos between the written material in a way that gives you a break from endless reading. Also, each video is only approximately 30 seconds to 2 minutes long. They avoid getting into the weeds too much at once, giving you chunks of knowledge, letting you test it out, then moving on to another topic. Each chapter points out that as the course progresses, you will go into further depth with each topic.