In order to fight or destroy a demon, we must first understand demons, that they are disembodied creatures, creatures that once existed from the union between Angels and humans/animals.
Every demon has a specialty and virtue and because of their Angelic side may be connected to an element or natural resource.
To fight a demon, we need to know the opposite of their demonic make up; few examples:
 
NIGHT TIME DEMONS
The first weapon against the Demons of darkness is light.
These demons are nocturnal spirit; they only come out at night when its dark. They live in dark caves and underground tunnels etc. Dark or night demons must leave the earth’s surface before sunrise, therefore, light is a destructive force to them. Although this can be broken down as there are different types of night demons.  
DEMONS OF FEAR
First weapon against the demon of fear is applying the virtue of Love. According to 1John 4:18, “There is no fear in love, but perfect love casts out fear, because fear has torment. He who fears has not been perfected in love.”
This fear means normal fear and phobias of all kind. John says that fear has torment and that identify phobias as tormenting demons. Anybody who suffers from phobia will know that it is a crippling mental and emotional torment to be caught is a phobic situation.
DEMONS OF DEATH
Here are few helpful strategies and tips. The demons of death can only be conquered by virtues of life. Whenever a demon of death is upon you, it means that there is a death warrant out for your life. With every death warrant there is a Demon Assassin and possibly a Demon Bounty Hunter assigned to take your life. This means there is a decree and sentence of death over you.
Here is how to fight the demons of death. Sit outside at the front of your house and begin to speak, quote and read aloud all scriptures about life. Death flee in the presence of life.
 
DEMONS OF WATER Demons may seek to invent and use demonic technology that may allow them to live longer on land.
DEMONS OF DRY PLACES
Demons of dry places can be destroyed by watery environments. These demons invoke sand storms, and barren dry grounds, and despise rain or water:  
HUMAN SPIRITS
Human spirits cannot be easily dealt due to the fact that they are humans and are still prone to the salvation of Christ, therefore, to deal with human spirits we must ask God to send his angels to disarm and deal with these human spirits.
Though we can bind and come against the powers by which they are projecting and moving, yet, the persons themselves must be handled by an Angel.

DEMONS OF WITCHCRAFT 
These Demons are called Familiars; they aid in witchcraft. All elements and substances created by God have their own role to play in creation and Salt is one of them.
In order to pray against witchcraft and sorcery you must be pure in heart and sinless.

DEMONS THAT INTERFERE WITH DREAMS
Strong Prayer and Worship before bed can bring a good sleep and help block demons that seek to invade your unconsciousness or dream. Also, sleeping with a light on and having soft worship songs play all night can help saturate the atmosphere against unclean spirits of bad dreams.
 
DEMONS OF SEXUALITY
Repentance, abstinence and deliverance will deal with the demons of sexuality. Anointing the Sacral regions of the body and anointing your entire spine, your kidney areas and your sexual organs can help deal with sexual spirits because that is where they dwell in the human body. Drive these demons into dry barren ground, and bind them there. Sexual demons are mostly water spirit and connects with the fluids in the body.
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DEMONS OF SICKNESS AND INFIRMITY
Sickness is a disruption of the cellular fluids. Once the fluids in the cells are interrupted the person will get sick because cellular fluids carry the necessities for proper cellular processes, functions and production of energy, cell division, cellular repair, and overall health.
Here is a strategy that many people have not taken note of in the scriptures. Before drinking water, first bless the water (Exo 23:25, “and he shall bless thy bread, and thy water;) to make it holy water (Num 5:17, “And the priest shall take holy water in an earthen vessel…).
Water helps with health, but when blessed can have a more spiritual benefit.
Also, applying the power of the wounds and the blood of the Messiah the Son of God is key strategy to combat these spirits.
 
FOREST DEMONS
Forest demons are spirits associated with the woods. These cause confusion and disorientation to the person, and may seek to mislead travelers in a wrong direction; many people got lost in the woods that way.
Praying and calling the fire of God to burn through the bushes will chase out demons just as animals flee from a forest fire.
 
DEMONS OF THE AIR
Atmospheric Demons causes storms, and disasters in the air. These are naturally flying demons, dragons, foul birds, and winged creatures.
These Demons can be opposed by the Aerial fire of Elijah. Also, the effect of defeating these Demons is to destroy their wings. We must first bind and destroy their wings, and pull them down from the air by prayer. But binding them in chains is essential, as many can be active in the air and land.