Here are the links for each:
- 2019: https://www.youtube.com/watch?v=6yqfmXiZTlM
- 2018: https://www.youtube.com/watch?v=HaEPXoXVf2k
- 2017: https://www.youtube.com/watch?v=jzeKPKpucS0
Additional DynamoDB links here: https://github.com/alexdebrie/awesome-dynamodb