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When writing a covered call, what's the difference between a “net debit” and a “net credit”?
When you buy a stock and sell a covered call, the call can't be valued higher than the stock, right? How can a call on a $10 stock sell for more than the stock?  So, the initial position of a covered call will cost you something. The transaction is a debit  to you. The net amount of the deal, usually prices as per stock/option single share.  For the image showing net credit, it's as if you expect to get paid for you to take this deal.