I try to follow "never sell at a loss" technique
This can be very dangerous. Make informed decision and take losses where you must. For example, if you shorted btc at 1800, it would be very foolish of you to not close it when price dropped to 1880 (and subsequently rebound to 2900) a few weeks ago.
And, keep away from > 1x margin.
Could you explain this more indepth please? I did not fully understand the example with the btc price. Also what is > 1x margin?
Also in regards to cryptoheadds post with"use stop losses", what exactly is stop losses?