AWS AppSync

AWS AppSync is a fully managed service that makes it easy to develop GraphQL APIs by handling the heavy lifting of securely connecting to data sources like AWS DynamoDB, Lambda, and more.

If you have complex APIs, that require many different data sources and possibly complex data transformations to produce their responses, or if you need a very efficient mechanism to build APIs for mobile and responsive web applications, AppSync is your to-go tool.

Here you are going to find some labs that will help you to learn more about it.

Read more here: https://aws.amazon.com/appsync/