The Incomplete Stable

In this Zelda: Tears of the Kingdom side quest guide, we'll give you the complete tutorial for the side quest: The Incomplete Stable.

This mission is accessible when you complete a Temple in the main story. Normally, you'll be able to unlock this mission when you complete the main quest: The Wind Temple.

To unlock the mission, simply head to the Lookout Standing and talk to Karson, who is standing in front of a stable. Karson will need your help to place a plank on the stable roof. Simply use your Ultrahand ability and place the wooden plank nearby on the roof. Move the plank to fill the hole in the roof. 

You now have access to the Stable location in the Hyrule Field area. You'll be able to take advantage of all the facilities this new stable has to offer, including registering your horse. This concludes the side quest: The Incomplete Stable.