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That is 100% true. People (myself included) keep advising everyone that it would be wise to just invest and hold it as long as possible, I keep saying the same thing to everyone I know as well. But this is true for things like bitcoin or ethereum, they can pick a shitcoin and they could lose all their money if they do the same thing.
It is always important, from short term trading, even including day trading, to long term investment, no matter what you do, it is important that you take care of the situation very well and do not pick a horrible shitcoin to invest. Otherwise you are going to end up with a situation that will cause you to lose a lot of money.