Apart from trading with other players, Wilderness Raiding is the only way to obtain resources that are required to upgrade your buildings. As a rule of thumb, a successful raid can only reward resources equal to, or less than, the tier level of the wilderness map (every successful raid is guaranteed to yield resources). Furthermore, there is also a chance to acquire rare food and/or gain experience, with the probability of obtaining these increasing in higher tier maps.
Dispatch your villagers to Forage Valley to gather basic resources. Hey now, everyone must start somewhere - even your villagers!
The snowy tundra of Mt. Cryptopia offers a variety of resources unavailable from Forage Valley. The next stage in your journey to greatness!
This uninhabitable desert stretches for as far as the eye can see, and many have perished searching for the unique resources that sporadically litter its landscape. Only for experienced villagers.
Many have entered, few have returned. Those who do survive speak of unthinkable horrors and vow never to return. But fortune favours the bold, and for the most experienced villagers, this should be a walk in the park. Hopefully..?