Crafting menu
This is the Crafting Menu in Valheim. To craft an item you will need to have the appropriate materials needed in your inventory. Left click the Item on the left side of the crafting menu you wish to craft. If all criteria are met the grayed out craft bar and the bottom of the menu will highlight. Click the craft bar and a timer bar will begin to count down. Clicking the craft bar again before the timer completes will cancel the crafting of the item. Once the item is complete it will be in your inventory. If you do not have space in your inventory the item will not start crafting and a notice will be given. To upgrade an item, the item and it's needed materials must be in your inventory. You will not be able to see the upgrade option for items unless they are in your inventory. The upgrade process is the same as the crafting process. Your bench will need to be at the appropriate level to be able to upgrade or craft items.
See Hammer and Workbench for more in-depth information.