I'm going to write about the otaku thing but I'm not sure about it.
I thought that they've done good explanations on otaku and cos-play ,
but I felt that the explanations on moe, tsundere and burikko were not exact.
They said that they use "moe" only to the characters on anime and manga,
but some people say "moe" to actual people like their favorite idol or maybe
to their friends.
I'm not sure about this, and it's really difficult to explain tsundere,
but I think tsundere is someone who can't tell their favor to someone they like
and behave a little cold.
Lastly, they said that burikko is used to old women who fake their cuteness,
but actually it is used to every female who fake their cuteness.
