Selling - Is there a right time to sell?

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It might exist (right time to sell) but I personally have not learnt how to do it after investing in penny stocks for more a decade...

Just my opinion, that maybe it's more important to know when NOT to sell, assuming much effort was put into selecting the company for investment in the first place.

It is irrational to assume the effort you put into the selection, will make the stock more valuable i.e. NOT to sell

The decision to sell, or NOT to sell, should depend on fundamental, rather than depend on buying price, effort and emotional factor of the stock

Of course, to understand that is easy, to execute is difficult.

Think my post was probably too vague (not very good at expressing my thoughts, i guess).

What I wanted to highlight is the level of conviction one has in a stock. It is IMO important to realize at which level that conviction should be (maybe from a scale from 1 to 5?), especially when pitted against an environment that is shouting at you to sell your shares.