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The most important thing is knowledge, and one shouldn't trade cryptocurrencies that they don't have any knowledge about. A lot of new traders make the same mistake, they start trading certain cryptocurrencies without having any knowledge about them and their movements, and eventually, they lose money out of their invested capital in those cryptocurrencies.
It's good to study and analyze the coin you want to invest.
I always do that to find out how good the coin is for the long term, but if you invest in Bitcoin or ETH, it no longer requires detailed analysis,
just knowing when to buy and when to exit with a profit.
Those who do not know anything about how to do trading strategies, management, of course they will not know what to do after buying and holding.
In the end, it will only panic when the price drops from the initial purchase limit.
source: http://www.binance.com