Descendants- Day 1: Kingdoms, Isles and Lands, Beast's rulling and how it affected the VKs, magic and magical beings
The first thing we learn about descendants in the start of the first movie is that Beauty and The Beast are like 'High' Rulers of all Kingdoms, even with Cinderellasburg (and other Disney princess' kingdoms) existing, they had all control over the decisions that would impact all of Auradon (even if a certain ruler don't agree with the decisions made by the 'higher' ruler). The second is that the barrier between Auradon and The Isle of The Lost exists for 20 YEARS.
Later on, we learn about Wonderland existing and being a whole different than the Isle of the Lost (because in the start of the movies, we just assumed that every villain were in the isle), since Queen of Hearts and Red were confined to Wonderland for 30 years (even tho, the isle's barrier fell, probably, 8 years ago)
And if Wonderland exists, that means Neverland should exist too, even tho Captain Hook and his son, the iconic Harry Hook, were stuck in the Isle of the Lost, which doesn't make any sense.
Beast's Rulling and ho it affected the VKs
When Belle and Beast married and Auradon was formed, Beast made decisions that affected Auradon's citizens perspective of the VKs, leading to a biased society who treats bad those who's parents did evil, even tho anyone could be or become a villain, no matter who their parents were.
And the decisions made by Belle and Beast was (being the biggest Beast hater that I am):
1. Ban all magic (only allowed in events beneficial, like Ben's coronation or Mal's entering to the royal court, to Auradon or to save said kingdom)
2. Not teach dependant (in magic) magical beings on how to control their abilities (JaneJane that even tho she's fairy godmother's daughter she didn't know how to do magic, Mal and others)
3. Bring back to life all of their villains or break them free of their prison that was made to protect others
4. If said villains have children, they will locked up in the same isle as their abusive parents, having zero to none basic life care (food, system and health care).
We also learn that magic and magical objects are forbidden in Auradon, which is strange since we see Fairy Godmother use her wand in Ben's Coronation, Mal's entering Court and her Resignation as Auradon Prep's Principal, which means that the use of magic only is permitted if it's beneficent to the kingdom (nah, I'm lying, it's if is beneficial to the royal family).
Jane, even with Fairy Godmother as her mother, didn't know how to control her magic or how to use it, she just knew the basic knowledge of it (how the enchanted lake and magical artifacts work).
As for Mal, she knew how magic worked and how to have some control over it (D1), since she already had some experience with it (the green eye thingy).
And Uma, who's mother was a Sea Witch, also knew a lot about magic and how it works.
The fact that magic in general was prohibited is ridiculous, Fairy Godmother existence is based on magic (she being a fairy already means that), just as Maleficent, she depends on her magic.
Plus, magic in Descendants is so badly explored, we don't know who could use magic (with Merlin Prep being the villains past) and how each of them carried out their destiny as villains and heroes.