When using a fire extinguisher, what should you focus on?

Focusing on the base of the fire is essential when using a fire extinguisher because the flames and combustion occur at that point. Aiming at the base allows the extinguishing agent to effectively reach the fuel source, which is critical for stopping the fire from spreading or growing. The extinguishing agent needs to interrupt the chemical reaction or cool the fuel to effectively mitigate the flames.

In contrast, focusing on other aspects such as the nearest exit may divert attention away from effectively combating the fire, while considering the environmental impact, though important, is not the immediate priority in a firefighting situation. Similarly, keeping track of where other firefighters are is important for team coordination but is secondary to actually addressing the fire directly. Therefore, directing efforts at the base of the fire is the most effective and immediate strategy for extinguishing it.