First Aid lets characters craft bandages for treating wounds out in the field.
Medic Zafira trains First Aid at the Sojourner’s Camp in Night Harbor. A medic stationed nearby will buy back any excess bandages you craft.
Specific bandage recipes and tiers for First Aid haven’t been fully documented on the wiki yet — check back as more information becomes available. Survival’s Cloth/Wool/Cotton bandage line is a close analog if you’re looking for the general shape of the recipes.
Survival — crafts a similar line of bandages from the same cloth materials.
Tailoring and Tanning — likely sources for First Aid’s cloth materials.