Thanks for this Alex! Will definitely check this out. DynamoDBGuide.com was a huge help to me when I was learning serverless last year to build wanderium.com. There's definitely a learning curve for DynamoDB but the performance is really good.

Do you talk about the best way to do aggregations in your book? That's one of the more annoying downsides of DynamoDB that I've kind of had to hack my way around. (I combine DynamoDB streams with a Lambda function to increment/decrement a count)