I don't think being a HODLER means that a person don't have any knowledge about trading,it shouldnt be considered as a basis to define a persons knowledge abiut trading. different person have different reasons and things they need to do that's why the prefer to hold.abd maybe others just don't have skills with it so they just decided to Hodl instead of doing trades.
Some of my friends don't know much about trading or knowledge about cryptocurrency, but they are interested in crypto and ask me if there is a chance for them to join. So I suggest to them to use some money to buy bitcoin only and focus with bitcoin, and they agree. They start in the two years ago when the price is not too high as now. After they invest, they didn't do anything and only get work in their real life, and the last year, they came to me and said that they are making a lot of profit from bitcoin and they already cash out their investment. This story means that we could be an investor and only hold bitcoin without trading and we can keep the bitcoin for a long time, and my friends already get their success. So if you want to hold, make sure you know what coin you want to hold and for how long you want to hold the coin, don't panic when something wrong happens and stays calm because, in the future, you can get the benefits of your investment.