The most expensive lesson I've learned in trading, is that stop loss orders DON'T WORK!
I don't care how clever you think you are, rely on a broker's stop loss function and eventually you will get ass-raped. HARD.
This is why I use diversification and position size to protect my portfolio.
Some people never put more than 1-2% in each position, I split my portfolio up in 7 portions allocated to one altcoin each.
This is sufficient to keep me out of danger but still make good profit when a coin moves up.
Besides this, I also keep a core holding in bitcoin that only ever gets added to, never sold off from.
Altcoins are for trading, bitcoin is for buy-&-HODL!
Regards,
Fileiro.