Smithing is a skill used to smelt ores (from mining) into bars, and working with the bars and a hammer to create various items of armour, weapons and tools. When you wish to smelt, go to an appropriate location and select the smelt bars option for the bars you wish to make. To smith, equip your hammer and select the smith option. You will be given a choice of metals to work with. Providing you have the correct bars and necessary smithing level, you will be given a list of things to make. Select one of these and you will make that item providing you have the sufficient materials. You will continue to make this item until you select a new item to make, run out of materials, or stop smithing. Below you can find information on smelting, smithing, and where to smelt/smith.
For smelting bars of metal, you need ore. You can get this from Mining. When Smithing the bars, you may also need to do some Woodcutting and get some wood to make tools.
The tools made from this skill can be used to woodcut, mine or even used in Combat.
When you have smelted some bars, you can make them into tools. Note that for some tools, you may also need some wood. While working, some of your items may be formed to a higher standard. This is called "Durability". Durability items can break more often than normal items as when they do break, instead of being removed from the inventory, they lose one point of durability.