Wrote a series of articles called "Learning GraphQL". In this series, I cover the basics of how GraphQL works, explaining the concepts of queries and mutations and how GraphQL allow us to create real-time apps using Subscriptions.
https://hashnode.com/series/learning-graphql-cjs5zufps002alvs25pkvibbc
https://hashnode.com/series/learning-graphql-cjs5zufps002alvs25pkvibbc