You need to practice how to control your emotions and nerves at tough times and to keep on reading more about crypto market as well.
One other thing is that you cannot finish learning in just one day, so you have to be ready to go all the way. The reason why a lot of people usually say HODL is because so many have missed out because they never had the idea of trading and to know when to enter a market or leave it which obviously made them to always regret their decisions. In cases like this, it is always better to just invest what you would not bother about and watch it grow over time, but if you can trade safely and effectively, it is always a better chance to grow your asset in quantity by taking advantage of the fluctuations.
That may be one reason, and maybe another would be others don't have the time or effort to learn trading but would want to profit or make a long term investment. Hodling would be their next best option because if you don't know how to trade properly, there's a big chance for you to lose your money. It may make a longer time to profit as compared to day trading but this is better for those who cannot control their emotions or have a hard time making market predictions.