if I, for example, have capital, I prefer to invest long term, to buy some altcoins which I think have the potential to grow rapidly in the future, and I expect big profits from the coins that I buy, because I am not very good at day trading , so I choose to invest a long period of time, while studying day trade.
I want to believe most people who are not vast traders with well-equipped knowledge on trading will definitely prefer to go this route. It is not a bad idea to invest long in as much as you know you are fine with the price you are buying from.
However, it is not also a bad idea to get to know some trading techniques to identify when it seems to be a good time to also be buying or not as the case may be. The best is just to find what one is comfortable with and stick with it.