Hold is advisable depends on market situation. Holding coins is good if the market is down but if the market is normal and keep increasing much better to hold it in a short time to make more profit.
Holding your coins is a perfect strategy, when the market is down it protects you from selling your coins from a very bad price, and when the market is up it protects you from selling your coins when the bull market is only beginning, the only problem with holding your coins is that some people set goals that are unrealistic, like all of those people that want the price of bitcoin to reach 1 million in the next years, but if you set a realistic goal you will eventually sell your coins for a lot more than what you bought them.