From Chris Boden.

The awesome shirt is in my store here!
I'm Deaf, You Asshole Shirt

Yes, the book is real and you can get it here.
https://amzn.to/3WexGfA

First choice, we always learn ASL from people who are deaf, so we send them here.
https://gallaudet.edu/asl-connect/

Here is a fantastic app, that works on both major families of phones.
https://www.lingvano.com/asl/

And by request from several of my sparkly friends.
https://www.queerasl.com/