Bountiful is a mod that adds bounty boards that can be found in villages around the world. With this mod, Minecraft will become even more interesting and will be a bit like an RPG, since you can complete quests and get bounties for them. On the boards you can see a variety of tasks, most often you need to return an item or kill certain mobs. Once you complete the quest, return to the bounty board and right-click on it to get your reward.
Your reputation will grow with the number of completed tasks. The higher its level, the more often quests with rare bounties appear on the boards. This is the Fabric version, but you can also download Bountiful for Forge.