'STOP LOSS TRADES' (it's not knowing how, it's knowing when)
"Use them at your own 'PERIL'".
If you place a 'stop loss' trade and then go off to work with piece of mind, you're just giving the MM's more 'AMMO' to play with a position.
It allows them to fill gaps easily with you're $$, they also pick up a ton of cheap shares on the way by! They can use them as steping stones to take the bid/ask to wherever they like without getting their 'toes wet'!
If you use a stop loss as a 'babysitter' in the AM, be prepared to be po'd in the PM! Don't blame the MM's for reaching down and taking your shares then let the position run to the next level.
"who gave them the AMMO?"