Ask HN: Online teachers/learners of HN

This goes out to all the teachers (and learners) who use the internet to gain or share knowledge. If you're a teacher (this could be a professor at a college or somebody who runs an online course on any topic) — 

1. What tool do you use to publish your courses? 2. What medium are you comfortable with teaching in? Text, Audio, Video? 3. How do you interact with your students? 4. Have you considered charging for your course? If you already do, how much do you charge? What led to you choosing that figure?

For learners — 

1. What medium are you most comfortable learning in? Text, Audio, Video? 2. Do you think that online courses are overly expensive? 3. Are teachers easy to approach? 4. What matters more to you: Learning, or certification?

If you have any elaborate thoughts on this that you'd like to share with me personally, please hit me up on Twitter: @Arsalan_Bashir, or email: mail[at]arsalanbashir.com