How do you turn on your flashlight in Gmod?

To turn on your flashlight in Garry's Mod (Gmod), you typically need to press the "L" key on your keyboard. If that doesn't work, you can also try binding the flashlight to a different key in the settings. Make sure that you have the flashlight equipped in your inventory if it's not working. Additionally, some game modes or servers may disable the flashlight feature.