When training your army, you can sub in a few wall breakers in place of Archers. Also, if you are TH6 or above, sub Healing Spells for Lightning. If you have more than 135 spaces, bring extra Giants or Archers.
Find a good match. Go for TH7's and below, unless you have high level troops and 200+ spaces in your army camps to take down a higher level. Check for CC troops by deploying a single Archer or Giant. Use lightning spell to take them out, or surround with a few Archers.
Deploy Giants first. Try to get them near Mortars or Wizard Towers to take them out. If you brought Wall Breakers, use them to punch through the first wall layers.
Deploy Archers and Wizards together behind the Giants. Make sure to spread them out and mix Wizards in among the Archers. Use Heal Spells on Giants if they are losing health.
The Giants will take out defenses and provide a meat shield for the Archers and Wizards, who will come in behind them and devastate the enemy base. You will get one to two stars if this is used correctly. On lower bases, you will get 3.