If someone are not familiar with trading, and lack of knowledge & skills & experience to effectively and profitable trading, they should only buy and hold. Buying and holding bitcoin will help them get profits from their investment in bitcoin. There is no reason to trade if you are not traders.
Maybe they can buy and sell when the price increase so they can make a profit. No matter if the profit amount is not too big depends on the other people, it still a profit and they can do that many times. But if they only want to buy and hold, then that will good for them as we see bitcoin price is up and down every day so they can still make a profit. We don't have to push ourselves to trade if we don't have skills and only hold in a long time that will help us to gain more profit.