What is the first think you should do if you discover a fire?

If you discover a fire, the first thing you should do is sound the alarm to alert others in the vicinity. Then, if it's safe to do so, evacuate the area and call emergency services to report the fire. Avoid trying to extinguish the fire unless it is small and manageable, and ensure to keep low to avoid smoke inhalation while exiting. Always prioritize your safety and the safety of others.