Why was learning to control fire so important for early people?

Long, long ago, a small band of early humans huddled in the dark, cold and a little hungry, watching lightning set a tree ablaze. Most animals ran from that flickering orange thing. But some clever ancestors of ours leaned in, squinted, and thought: "What if we could keep that?" Keeping the fire turned out to be one of the most important things our species ever did.
Here's the thing about fire: it doesn't last on its own. It eats wood, and when the wood runs out, it dies. So the first trick early people learned wasn't making fire — it was keeping a fire alive, feeding it sticks like you'd feed a hungry pet that never sleeps. Carrying a glowing ember from place to place became a precious job.
