Attacking Tips
When attacking another base, be sure to have some giants (two or three of them). What this will do, is when your attacking, deploy your giants first and then deploy the rest of your troops. Your opponents defenses will be distracted on the giants while the rest of your infantry is destroying their base.
Defending Tips
When designing your base make sure to leave out some extra walls. What you do with these walls is put them at certain points of your base that get attacked by wall breakers frequently. What this will do is mess up the wall breakers so they wont attack your actually walls and instead attack your decoy walls.