Some questions about selling bitcoin

I got a bunch of questions on bitcoin that I can't understand and would like answers if possible.

1. What is the minimum amount that is needed to sell bitcoins if a specific amount is required?
2. If there is no minimum amount, then would it be possible to sell bitcoins even with the lowest value as in 0.00000010 or something?
3. How to sell bitcoins from peer to peer?
4. How much of value does a BCH have compared to BTC and would it be worth selling either one?

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source https://www.reddit.com/r/btc/comments/ifixv1/some_questions_about_selling_bitcoin/