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Trading and investing are different from each other. As jjdub7 posted in
this thread,
You need skills to succeed in both.
Trading is more rewarding, but it's 'active'. You have to follow news, indicators, and so on daily.
On the other hand, investing is more passive after the initial due diligence where to put the money...
I think you are talking about investing and not trading. We can all get rich through trading, but it is not that easy. We can talk about how we should control our emotions, what we should do in a certain movement or anything like that but it will all still end up on how you will be managing your funds and your investments.
Controlling emotions somehow applies to holding as well, since like me I usually take a peak in the price quite often like spamming F5 in the price charts since it is being updated continuously anyway.
Some people are just too emotionally driven by the price because what they invest were like all sacrifices from their assets and that's really really bad move.