Kenobi by John Jackson Miller
After losing almost everything to Palpatine's newly declared Empire, Jedi hero Obi-Wan Kenobi must learn to live as a hermit on the remote desert planet of Tatooine. His mission: to lay low for decades while guarding the infant son of Anakin Skywalker. However, it seems trouble has a way of finding him even here.

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This is a classic era book from the Legends timeline. It will likely be contradicted by newer books, movies, or TV shows (if so, just think of it as an alternate universe).