On doit être responsable de sa propre conduite.
One must be responsible for one's conduct.
L'éthique veut dire les règles de conduite.
Ethics means the rules of conduct.
Cet accident est dû à la mauvaise conduite.
The accident was due to bad driving.
FrenchTextbook teaches rules like this, in a full beginner course.
162 lessons, 4,000+ exercises, and 6+ hours of audio.