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This feature has not been implemented yet. Maybe a job for YOU???
If you are new to Letexa and would like to help create content, but don't want to be responsible for creating a whole big course, you can look here.
This page lists where parts of courses need (additional) content. For big courses, such as one about "Linux", no one person can do everything. However, one person can create an outline for what chapters should be in the course, and start creating only some of them they feel comfortable in themselves. You have a chance to pick one of the other topics from the list on this page, and register yourself as a potential author for that course.
If the course sells, you will receive income equal to your share of contributed content. Used for evaluating that share are statistics, as far as available, from within the course (the course viewer contains code that reports back what sections a user actually views), user feedback, and other rules set jointly by the authors.