Courses are similar to actual classes in a traditional education sense. They are a wrapper of video lessons, quizzes, and exercises.
Clicking on a course will take you to the course landing page. Here you can review the trailer, and read about what the course will be about before deciding to dig into it.
Clicking Begin Course will take you to the first lesson view of the course. This view contains the video player, list of lessons, any course files and information about the course. Here you are also able to ask questions while you're learning.
Each course primarily will contain video lessons. These lessons, exercises and quizzes are organized within chapters.
If there isn't a clear introduction video, the about page is a descriptive overview of what you'll learn by taking the course.
Have a question about the course before you take it or if you're stuck in a certain area. Ask your questions here and answer other students.
Typically project files and HD video lessons are available for download to Pro members. These files are .zipped to allow quick download and less chance of corruption. To extract these use a .zip extraction software.