Thread:Nyen/@comment-79.101.171.11-20130416092045/@comment-4812462-20130416123401

To answer you question, the fastest and best way is to upgrade buildings,  the more resources the upgrade costs, the more exp you will get (especially lv 4 defense tower upgrades). Researching will not give you any exp.

Looting resources from player bases and rouge bases will yeild exp. For every 50 res looted, you will get 1 exp.