The NYTimes has webinars and distance learning options for the teen crowd

https://www.nytimes.com/section/learning

I don't know if this is useful without a subscription. Some people may be subscribed through their libraries.

Walt Disney Imagineering Partners With Khan Academy To Bring You ‘Imagineering in a Box’

This isn't coronavirus related, but you can use it now. No personal experience with this one, I'm afraid: https://disneyparks.disney.go.com/blog/2019/08/walt-disney-imagineering-partners-with-khan-academy-to-bring-you-imagineering-in-a-box/

For the more bookish child, many authors are doing special things for their readers during this time: https://bookriot.com/2020/03/16/kidlit-authors-stepping-up-during-the-covid-19-crisis-and-quarantine/

Also, for those who can't carry a tune in a bucket: https://bookriot.com/2020/03/16/short-poems-to-recite-while-you-wash-your-hands/

I have recently discovered that the first Xanth book, Spell for Chameleon, has a new cover

Putting aside every bad thing anybody's ever said about Piers Anthony in general or Xanth in particular, this cover is all wrong.

In other book news, ellenmillion and rachelmanija are both offering up free ebooks of their published works:

https://ellenmillion.dreamwidth.org/1674611.html

https://rachelmanija.dreamwidth.org/2353621.html