How were Ultraman's series divided, like the Shōwa series...

The Ultraman series was very popular in Japan, so there were some classifications. Usually, Ultraman series could be divided according to the time sequence or storyline. One way of sorting was to sort them by time, which was to sort them by the release time of the Ultraman series. The Ultraman series in this category were usually divided into the following stages: 1 Showa Ultraman (1966): This is the first Ultraman series produced by the Japanese special television production company, ADK. It included two main works: Ultraman, Ultraman 2, and Ultraman 3. 2 Heisei Ultraman (1996): This is the second Ultraman series produced by the Japanese special television production company, ADK. It consisted of three main works: Ultraman, Ultraman X, and Ultraman. 3 New Generation Ultraman (2021): This is the third Ultraman series produced by Japanese special TV production company ADK. It included three main works: Ultraman: Galaxy Legend, Ultraman: Academy of Monsters and Humanoid Monsters, and Ultraman: Beyond Galaxy Legend. Another way to classify them was by storyline, which was to classify them according to the main storyline of the Ultraman series. The Ultraman series in this category were usually divided into the following stages: 1 Showa Ultraman (1966): This is the first Ultraman series produced by the Japanese special television production company, ADK. It included two main works: Ultraman, Ultraman 2, and Ultraman 3. The main storyline of this series was the battle between Ultraman and the monsters. 2 Heisei Ultraman (1996): This is the second Ultraman series produced by the Japanese special television production company, ADK. It consisted of three main works: Ultraman, Ultraman X, and Ultraman. The main storyline of this series was the battle between Ultraman and aliens. 3 New Generation Ultraman (2021): This is the third Ultraman series produced by Japanese special TV production company ADK. It included three main works: Ultraman: Galaxy Legend, Ultraman: Academy of Monsters and Humanoid Monsters, and Ultraman: Beyond Galaxy Legend. The main storyline of this series was the battle between Ultraman, monsters, and aliens.