What is a good rule to follow when using a fire extinguisher?

Aiming at the base of the fire is crucial because this is where the fuel source is located, making it the most effective area to extinguish the flames. Fires need oxygen to burn, and by targeting the base, you are disrupting the fuel that sustains the fire. This approach can help prevent the fire from spreading and allows for a more effective response.

On the other hand, pointing at the flames, shaking the extinguisher before use, or using it only when the fire is small do not offer the same level of effectiveness in extinguishing the fire. Pointing at the flames may not adequately address the source of the fire, and shaking the extinguisher could potentially lead to a malfunction or waste of the fire-fighting agent. Additionally, while using an extinguisher on a small fire is generally safer, the focus should always be on where you aim to effectively put out the fire.