Guide:Moon Lord strategies

Movement
An almost quintessential item for fighting the Moon Lord is the Cosmic Car Key or the Shrimpy Truffle (make sure to have water around you). While moving diagonally away from the Moon Lord, the player is slightly faster than him, allowing for you to take out one hand going one direction across the map and take out the other one vice-versa. This is best performed with a set of Spectre Armor for the healing effect; it is extremely hard to dodge his head laser.

The other (more risky) way is to fly circles around him, this is once again, much easier when performed with the Cosmic Car Key or the Shrimpy Truffle. Going around him allows for the player to dodge the head laser. *Keep note that this strategy requires much more dodging than the previous one.*

Terrain preparation
Since this boss requires a lot of dodging, the best way to prepare your arena is to use a big open field to fight it. It is extremely helpful to place one teleprter in the arena and another in the nurse's house, so you can heal yourself. You dont need platforms in your arena because the Cosmic Car Key and the Shrimpy Truffle provide infinite flight.

Gearing up
A set of Spectre Armor or Beetle Armor will do well on him. Also a good pair of wings such as Fishron Wings. These will help you dodge his lasers. For melee, equip a Flairon or higher and Vampire Knives to heal you. For a ranged weapon, a Phantasm Bow with Holy Arrows, or the Vortex Beater. To compensate for damage, it may be wise to bring along some Super Healing Potions. It will be harder to fight it as ranged or summoner, since you don't have a healing weapon.

To fight it with two players, it is very helpful to fight it with one melee/mage and one ranged, the melee/mage tanks it using Vampire Knives / Razorpine while the ranged uses a Phantasm Bow to deal high DPS.