Resources
All the free ways to get resources without spending a penny.
Idle Collection
Resources generated by your resource buildings over time. Amounts are affected by building levels and certain researches. Don't forget to collect from the Idle Chest next to your HQ regularly.
Gathering
Send your troops out to mine resource tiles on the map. Use the magnifying glass (bottom-left) to find exactly what you need. If you're going offline for several hours, always send your troops out gathering before you go.
Raiding / Looting
Attacking another player's HQ for their resources. This is the most effective method when done right. Your daily loot limit depends on your HQ level. See the Looting guide for full details.
Radar Events
Events in your Radar give various rewards including resources. Do these regularly when you have spare fuel.
Event Rewards
All events give some resources as rewards. Participating and doing well generally earns more. Check the different pages in Events Centre for specific rewards.
Black Market
When you run out of resources, the game offers transactions at 1,000 resources per 1 diamond. This is never worth it. Instead, go to the Black Market and check the VIP Store. See the Black Market guide for details.
Warehouse
Over time you accumulate resource chests. Their value is tied to your HQ level, so the longer you save them, the more they're worth.