Ah, yes. The speech text hint is not clear enough. When you have them clear a bush, the wood goes into the fire. Then if they are at the fire when you resolve the turn it will light and they get happiness. Then there are relics, food and abilities etc that improve happiness.
This is good feedback.
At the map there are clues to the sites on the hex tile. In camp you can uncover them to get important upgrades. The early versions of the game were aimed at working out the mechanics by trial and error but im shifting toward clearer info. Still some gaps :)