Armoured With the Truth!

We walk (and war or resist the devil) by faith in God (not in the
flesh), but in God's strength and might!
One of Satan's primary tactics is to get you to "war in the flesh" and in the world against other humans. He doesn't want you to fight the good fight of faith; he wants to bring you down to his ground, he wants you to fight among yourselves in the world, and in so doing, to cripple you spiritually, by causing you to resist the wrong enemy! Ephesians 6:12
Now to each piece of the Armour of God: What is it? How do I put it on?
How do I use it? First: What is it?