The following are some Absinthe-specific educational resources that are available.
- Craft GraphQL APIs in Elixir with Absinthe by the creators of Absinthe.
- Website (mostly just links elsewhere)
- Documentation (current stable release)
- How to GraphQL (with Absinthe)
- Live APIs with GraphQL Subscriptions, ElixirConf 2017 (Bellevue)
- GraphQL in Practice, ElixirConf EU 2017 (Barcelona)
There's a ton of GraphQL resources on the web.