Terraria World Modes and items

Expert mode is an option that can be select during world creation. it gratly increases the difficulty of the game, as well as the quantiy and quality of drops. it also offers Expert mode-exclusive items. Expert mode begins the moment the Expert-mode world is crated, and cannot be altered after that by the player.

for more info about terraria expert mode heres the link
http://terraria.gamepedia.com/Expert_mode

for info about normal
http://terraria.gamepedia.com/Difficulty#Normal_mode

for info about the items for normal & hardmode the links are down there
http://terraria.gamepedia.com/Items
and final info about the all types of weapons
http://terraria.gamepedia.com/Melee_weapons
http://terraria.gamepedia.com/Ranged_weapons
http://terraria.gamepedia.com/Magic_weapons
http://terraria.gamepedia.com/Summon_weapons

Terraria studio
Terraria studio
Terraria studio