I think holding bitcoin is a good idea because it is a big chance to increase its price and you can have a good profit maybe
hold just is not right, the bitcoin selling price is very volatile, you cant just hold ? if you hold and bitcoin prices down, what would you do?
Holding and also selling when the price of bitcoin goes up, he just forget to say also to sell when the price goes up. But holding coins even if its price are low is ok, you'll just wait again to increase its price.