Anybody can advice on setting stop prices and knowing when to sell when a stock you invested in is dipping?

Well, ideally speaking, one should already did his/her homework before buying

Most investors I know do not place stop losses. However I operate from a hybrid point of view, where I utilise both technical and fundamentals.

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As part of risk management, I place stop losses at no more than 8% of a stock price. On top of that, the losses of each position will not exceed 1.25% of my portfolio value.

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It is subjective to many if the stock is dipping. Dipping could be price drops below the buy price, drops below a certain trend or moving average, or a 10%, 20% drop etc.

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The above is only a small part, but hope it helps.