Fiber is a very useful resource in New World MMO and it's not very difficult to get. But many new players experience difficulties with finding it. That's because there are no “Fiber Nodes” on the map. Many players are looking for such nodes but don't find them.
If you want to get this resource you need to look for Hemp instead! This plant will give you Fiber after you harvest it. As you see, it's a little bit misleading and that's why many players have problems. Note, that you will need a Sickle in order to cut these plants and get resources.
Hemp plants are located in Forests and Grassland. They are tall plants with small pink flowers on top and they are very easy to spot.
If you want to find out where to find Hemp, open the map and look at the legend. The territory markup will help you a lot.