First, simply investing isn't "low risk" but rather involves lower risk when compared to trading. However, both of them work just fine. One main advantage of simply investing rather than trading is that you don't need any special knowledge, all you need to do is make the purchase. But on the other hand, not only do you need to have knowledge of trading, you have to be good at it and be able to make your own call. So, if you have the knowledge to trade, give it a shot to see how good you are. If it's not so good, you can learn more or stick to simply investing.
Holding doesn't require much complicated knowledge but that doesn't mean you don't need knowledge. How can you buy and have enough confidence to hold bitcoin long term until it makes a profit if you have no knowledge? Trust and patience are two important and necessary things to be able to hold bitcoin long termm and to have those two things you need knowledge about bitcoin. And for a newbie like OP, I also think investing will be more suitable for him than trading even though trading will bring better profits.
It's indeed that holding doesn't require more effort as you only need knowledge whenever you will exit the market to get profit. For trading you would need to have analyzation, skills and always checking the market. You would also apply emotional and metal ability in order for you to have proper calls and get profits as well. But holding doesn't mean you would only hold it, it's like you're keeping a treasure not knowing the steps and what to do with it, so you really need knowledge as well in long term investment. Thing is in long term, by the word itself "long", you would require a lot of patience and consistency for you achieve your financial goal cause quick profits will go to trading. Trading is really complicated which is not recommendable to newbie unless he already have the knowledge and experience.
Many people say holding is simple but I believe it will only be simple when we compare it with trading, it is not simple at all. Holding an asset for 3 to 4 years is not simple if we do not have enough faith and perseverance. Buying is something anyone can do, but holding for the long term is something not many people can do, which is why so many people sell during bear markets. And those people mostly don't have enough faith and patience.