What is headcanons?

@Abdalla1234 Headcanon refers to something that a fan imagines to be true about a character even though no information supporting that belief is spelled out in the text.

Maybe the user will get hunches about what to do while trading and accidentally buy shares that make him rich passively. He might be like. Oh well I am gonna invest 999$ in Superpower Ltd. cuz I feel like it today and in a few days the company announces that it will give massive dividends in the next month payment date as it made obscene amounts of profit suddenly. It would be better if the Mc knows what to do in the stock market better as he just has to try and the power could point him what to do to rake in wads of cash out of sheer luck and people won't be able to figure out the user's trading strategy.