I and my friend bought our first crypto in april 2017. I started trading from the first day for 1/2 of my deposit and my friend just holded all his coins and keeps holding them. Some of my altcoins now cost 2-3 times less then when I bought them, but I believe they will do XXX.
I can say that today my HODL friend is much richer than me 

So if you are not a professional trader - just hold good coins