From this page of the Valheim guide, you will learn how to get your hands on the Needle, a useful crafting resource.
The Needle is one of the resources that can be found while exploring the vast world of Valheim. Needles are used to make Needle arrows and the Porcupine mace.
You can obtain a Needle after defeating the Deathsquito, which can be found in the Plains biome. Since these creatures are able to fly, you might want to take them down using a bow.