The Blacksmith works smelts raw harvested ore into various metals to be fashioned into components & usable materials. Blacksmiths also craft the strongest weapons and armor from the sturdiest metal components. In addition to weapons, Blacksmiths work includes forging & manipulating metals into strong components for structures and other crafters. Blacksmiths eventually develop their skills more as an Armorsmith or as a Weaponsmith.
Armorsmiths are responsible for fashioning some of the finest armor pieces available to characters.
Weaponsmiths are responsible for crafting some of the most powerful weapons characters can wield.
At level 11 you are given a quest allowing you to choose a specialization within you parent tradeskill. Blacksmiths can pick Armor Smith or Weapon Smith.
Once you pick a specialization, or sooner if you know which route you plan to take before hand, you should set the option that you do not choose to negative (the – button on the right of the bar on the skills window). This will push your skill in that other type down to 0 and allow you to put those points back into the two skill types you will need (your parent type and your specialization type). Do not leave points in the type you didn’t specialize in, or you will only hurt your ability to craft items of your specialization as well as delay when you learn new skills.
You may change specializations later on if you choose, but you will lose all recipes, including special dropped rare recipes if you do. If you change within your parent class, such as Tailoring to Leatherworking, you will not lose any skill points but you will need to change the direction of your skills to drive them in the right direction. If you change to another trade entirely, like tailoring to carpenter, you start over at level 1 with 0 skills.
Blacksmiths must harvest materials suitable for their crafting skill, such as metal ore (mining)
Information takn from VanguardMMORPG