Stop loss is one of trading's most useful tools. Personally, I lost a substantial amount of money just because I was in a shoulder-free business. Unfortunately, choosing the right stop size is particularly difficult now because market manipulators simply knock out the stops with some actions. However, even if this factor is taken into account, it is impossible not to use such a useful tool, because without using it you will surely lose more. Stop loss minimises your risk and the likelihood of error.