Since Chamonix-Mont-Blanc is a major tourist town and resort center, security here is treated carefully. There is practically no crime in the town, just be careful with petty pickpocketing, do not leave valuables in a visible place. After all, guests can be different. In any case, every hotel, restaurant, bar, any large institution has its own security. And the police station will help you with any important question.
At ski slopes, near the elevators, there are always working rescue squads, there are helicopters and all-terrain vehicles in case of tourists lost in the mountains. Qualified instructors will support beginners and leave no one without help.