4 ms·Yes, there is. Selling books, seminars, and certifications is very common in the Linux world.by cycloptic 6y agoYes, there is. Selling books, seminars, and certifications is very common in the Linux world.Shared404 6y agoBut most of those are targeted to the IT side of things, aren't they? I don't recall having seen much targeting end users.cycloptic 6y agoIt really depends on what you're looking for. I've found for popular applications there are usually tutorials on Youtube at the very least.