One of the first side quests in Dying Light 2 is called The History Lesson. As part of it, you need to explore the area, but it is not entirely clear what exactly is being asked to study. The quest giver will set the point to which you need to go in order to learn something from the history of Villedor. You need to interact with certain parts of the memorial. Some are obvious, but there is one you may not notice.
Use your Survivor's Sense by pressing Q to figure out which parts to explore. All of the locations and clues you need are highlighted in red. First examine the plaque in front of the monument. After a short dialogue, you need to go to the tree, which is located to the right of the monument. Look for footprints left on the tree. That's all it takes to complete the quest.