100% agreed on the story. There’s a recap video that’s probably not too hard to find on youtube which takes 30 minutes to explain the story up to the start of KH3 and I remember a predictable amount of it. There’s also this gem:
https://youtube.com/watch?v=fCWjSOSWiUwI only know enough about what “Aqua got ‘Norted” means to put an apostrophe in front of ‘Norted. (Xehanort possesses people or whatever.) I also literally never saw Aqua in any game I played before KH3, except maybe as an extra I didn’t notice.