Last month, September 2017, I gave a talk twice on my experiences learning React, GraphQl, Apollo Client, along with installing a GraphQL API to an ancient legacy app, all at once.
The version I gave the prior Monday at the Ruby MN meetup was much longer, and included quite a bit of information on the Ruby GraphQL API. Maybe someday it will all get filmed. :D
In the meantime, the slides are up on Github at https://tamouse.github.io/Talk-Rails-GraphQL-React/#/ (The slide repo is at https://github.com/tamouse/Talk-Rails-GraphQL-React.)
The repo that contains my sandbox / learning application is at https://github.com/tamouse/r5_graphql_react.