If it is a longterm investment that requires one to hodl Bitcoin I don't think one needs much knowledge to hodl Bitcoin, in hodling what one needs to understand is just to have patience and not to be in panic if the market is going dip because it will definitely come up again. Trading needs more knowledge, it is impossible for someone who knows nothing about trading to start trading and will succeed in making good profits out from trading. Their are rules and principles in trading, their are also strategies in trading that beginners needs to know before starting trading. Trading is not luck or gambling that anyone can be lucky to win, trading is a skill and institution that people needs knowledge to do it proper to reduce the rate of money that can be lose.
Still, for long term investment if you don't have know idea what you are doing you will experience panic everytime the market dip or everytime you will check your PNL, they should know at least the basic one. In everything knowing nothing is pure useless, we should do a little bit effort in order for us to make it successfull or in order for us not to regret things because we fully understand it.