@GirishIyer1971 I think you are getting some bad advice here. You are asking "do I need" or "do I have to", in other words you are asking for MINUMUM critical specifications. Is your purpose to just publish a course so you can say you published a course, or are you trying to sell that course, gain followers, and create a profitable business? No one succeeds in business by doing the minimum required because you are competing against people who are not doing the minimum, they are doing the BEST they can possibly do. They are doing the maximum, not the minimum. They are seeking to provide the best possible experience, the best value. Those are the instructors who succeed in selling courses and making money. Students want to connect with their instructors. They want to know who they are. They want to be able to trust them. And... they even want to LIKE them. No one likes a voice behind a powerpoint! You are not making a personal connection. You aren't selling yourself to your potential students. You are disconnected, faceless, boring! No, you don't "have to" show your face. But that is the wrong question.
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