Hello, I’ve been following Unity probably from v1 
but never tried to make working game , just tried several tutorials and etc. Now I have three kids 7,6,6 ( twins ) and I would like to create simple android game for them to learn for example country flags ( I know phone is not the best way to do this, but it could help in some cases :)).
Idea is simple - two country flags are being shown , and kid should select correct based on the text ( yes they can read ). Somethin similar to this https://play.google.com/store/apps/details?id=com.morlicando.learncites&hl=en
I would highly appreciate some link to quiz tutorial on unity , meanwhile I will buy some book, any advice for Unity 2D for beginners? Good luck !
If you want a book, Unity in Action includes a chapter where you develop a 2D game similar to that.