Class curriculum is available for review on the information page. Any other information you need to complete the course is there too, like suggested reading, etc.

Some courses have a preview or two, of some of the lessons.

Finally you will see a Course enrollment button. Click on it to enroll.

On paid courses, you will need to fill in your payment details. Your credit card will be charged according to your directives. You will then be directed to your course.

You will go directly to the course if the course is free.