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If you are a teacher, write in the article price in SBD or STEEM. It's obligatory.
Other payment requirements you can describe in the article or explain in private conversation with person who wants to take the lesson.

Some teachers may require the payment before lesson, other agree to get the money after. Paying before is fine, although it's risky if teacher has low reputation or is Newcomer.

Coming to talk of reputation what's the minimum?

 3 years ago 

I guess the payment you can just decide between you and teacher. If you are a teacher you can put the approximate price and then adjust with a student

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