There is so much to learn in this game here are a few items that are important
Most if not all of the pictures are from the PC version of the game that apple and android version are similar in function.
Invaders
Clan vs Clan battles
Every week there are clan vs clan battles they start here are some links to posts from the blog portion dealing with the Clan vs Clan (CVC, CvC, or cvc) battles. These start at midnight GMT on Monday evening/Tuesday mornin depending on where you are located in the world
Getting involved in a CVC battle
What to expect in a CVC battle
Armor
Having the right armor is important as you get further into the game here are some pointers that I have picked up from other players