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Selling meaning a bad ending , that's all.
Selling at the wrong time would mean a bad ending. There are times to sell which is when the market is rising and not selling during that time is a loss.
One must understand that in order to sustain trading in this market, they must buy at the low and also sell at the top. Not doing both or skipping one will lead to frustration and stagnancy in the trader's mind which leads to bad incidents.
Whales will always buy bitcoin in every dip bitcoin goes , whales knows the secret of becoming rich in bitcoin, that is why they see every dip as an opportunity to buy bitcoin. We need to learn from the whales and see reasons why they buy bitcoin in every dip. It is better to hodl now than to sell bitcoin to whales at loss.
For newbies entering the market this is important to realize. That the bull and bear cycles are continuous and taking advantage over both is necessary to be the proper trader. There is a lot of FUD and bad speakers in the market, but the reality is that bitcoin always bounces back, it is just a matter of time.