Hey there guys! This is a nice post on how to defeat the Eye of Cthulhu in Terraria.
One thing you will probably want to do first, is to set up platform layers everywhere.
You also want to set up campfires all over the area that you will be fighting him. This will increase your life regeneration, which is very good for fighting the Eye of Cthulhu.
What you want to do is to keep on avoiding and dodging the Eye of Cthulhu. If he hits you, you can take a lot of damage, which is a terrible thing. You want to make sure that you have a big supply of healing potions. Accessories that increase health regeneration and decrease potion times are great.
You want to also have the best swords and armour you can collect. The probably best thing you can get is some metal armour. Metal tools are probably the best too. Bows are great too. Fire arrows are one of the best arrows to have. The gold bow is probably the best bow for that stage. You also want a HUMONGOUS supply of Shurikens, or throwing knives.
You can check out a video I've made by going to these two links:
Check out these links too: