Should we always add fresh capital in stocks?

#1
Should we always add fresh capital in stocks or reinvest the profits?

What could be the ideal strategy to create a huge portfolio?

How to know what is the ideal buying price and ideal selling price?If we have a handsome profit and the greed of anticipating more rise and suddenly the stock reverses its trend , then everything gets wiped out.

Lots of questions in mind.Kindly advise.
 

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