And that slide-y thing at the bottom of the grill basin, under your charcoal? Those are the vents! Both control the flow of air inside of the grill, which changes the heat level and direction.

the cooler the internal temperature of the grill. No air and the fire goes out. On my Weber kettle, I always start with all three bottom vents open. Then I close each partially to get the ...

You should always be mindful of the vent on the bottom of the grill since it controls the fire. Just like you, fire needs air ...