Giant/Archers attack
In general; use Giants as tanks to soak up defense damage and Archers/Wizards to destroy buildings
So it's better to deploy them in groups than all giants together
But... Patrick knows best:
https://www.youtube.com/watch?v=k7ZUS3zlrPE
Hogrider Attack
Video on attack strategy for Hog riders
https://www.youtube.com/watch?v=k3L2TVNgy2M&feature=youtu.be
Balloon Attack
Make sure to eliminate Queen/CC before going in. Or draw Queen/CC to the spot where you go in so they die on splash damage.
Minions are perfect to deploy wright after the balloons, they wrap up all non-defense and make sure your get your 50% and loot
Use rage and healing spells. Much better than taking out one air def with lightning spells.
Deploy balloons near air defense. Watch Wizard towers, you need healing spell near them.
Balloon attacks only realy pay off with the lvl 6 balloons. Lower lvls die to easily.
Dragon Attack
The Dragon attack can work great for lower lvl players to get stars in a CW against tough bases. In regular battles it can not be used economically. It's simply to expensive.
Make sure to eliminate Queen/CC before going in.
Healing spells do not effect Dragons that much, unless it can be used on a couple of dragons which stay in the circle for a while. Rage will help a lot on dragons
Go in from one side and spread the dragons over the full length of that side. When they are near centre put two rage spells over the full length and use a 3th, 4th or 5th spell in the same way so they wrap up the base in a straight line.