Huge risk if trading a company stock

it is a good lesson for me, as I found its chart looked pretty in technical ways
- a 3 month consolidation after long term downward trend
- Bottom confirmed several times
- price increased with volume
- triangle patterns in the upward trend
however, it failed to continue increase after broke out the triangle. and it is over 10% loss a day.
Lesson for all trader trading company stock, no matter how pretty the chart looks like, make sure set STOP order!