"Hodl" is word used to much in crypto space but i think hodl can be dangerous for newbies mostly they will be shilled and hodl a shitcoin or hodl a solid coin for too long and wouldn't sell when time was right you will end up like me as there was time when i could buy tesla now i can only buy honda.
holding is not dangerous as long as you study well what coins you want to hold, and also look at hydro it drops at first and it have a long cap pointing downwards it means it increases it value right now. we should always remember that in every investment their is a risk so you should not put what you cant afford to loose.
hold will be dangerous if done by someone who holds a coin is not good, because now this coin that has the potential if dihold would provide benefits. so I think there is nothing dangerous with hold.