DynamoDB
Tutorials - https://www.youtube.com/c/EnricoPortolan/search?query=dynamodb
Amazon DynamoDB Learning Plan - https://explore.skillbuilder.aws/learn/public/learning_plan/view/1840/amazon-dynamodb-learning-plan
Single table design
https://www.reddit.com/r/aws/comments/xq1p6s/comment/iq7m7g4/