I am trying AWS Cognito using boto3.
I find it difficult to understand by reading the AWS documentation.
I am looking for an example or tutorial which has a step-by-step explanation.

I already have a facebook app and Cognito identity pool created.

Something like backspace Cognito tutorial for node.js

I found couple of examples for integrating with Cognito using boto3.

1. Amazon AWS Cognito and Python Boto3 to establish AWS connection and upload file to Bucket
2. https://forums.aws.amazon.com/thread.jspa?messageID=685264

You also take a look at the boto3 API documentation for Cognito Identity and Cognito Sync for more details.