Since the second phase of the Star Wars: The High Republic subseries has come to a close, readers might be trying to catch up with the subseries before the third phase begins in September. Since many of the stories overlap, particularly during the Battle of Jedha, the reading order can get especially confusing. Unlike the first phase, Star Wars: The High Republic subseries Phase II was created so readers could enjoy the middle-grade, young adult, and adult books independently of each other, with the books representing a duology for each of the various age ranges. Still, reading all the works within this phase will give readers a more complete version of the story of the beginning of the High Republic era's age of exploration.
Source：https://www.cbr.com/star-wars-high-republic-best-reading-order-phase-2/
