Place it, then E at it: ingots, leather, weapons, and levelling up the weapon in hand.
Crafting
By hand
Hide ×2
Mortar ×2
Stick ×6
Stone ×12
Place it, then E at it: ingots, leather, chain, weapons, and levelling up the weapon in hand.
Traders' prices are before the Merchant skill. What they pay adds up across sales, fractions included.