The game Red Dead Redemption 2 has 19 old huts. In order to pass the game 100%, it is not necessary to search for all of them. It is enough to find only 5. It is almost part of the collection, to see the list, you need to visit Progress. You can visit each of the Huts only after the end of the prologue and reaching Chapter 2. Inside there are often useful loots and cigarette cards. You can also visit them after the story ends.
Not all are required to find, it is enough to find only 5, and the rest is optional.