Books:

User Stories Applied: For Agile Software Development book by Mike Cohn. Nice overview of personas, stories, and how acceptance criteria and testing are interwoven. https://www.amazon.com/User-Stories-Applied-Software-Development/dp/0321205685/ref=sr_1_1?ie=UTF8&qid=1459816833&sr=8-1&keywords=user+stories+applied

Agile Retrospectives – Making Good Teams Great book by Esther Derby and Diana Larsen. Preparation for the retrospective starts well before the meeting. Provides structure with which for Scrum Masters can approach retrospectives as well as different ways of conducting them. https://www.amazon.com/Agile-Retrospectives-Making-Teams-Great/dp/0977616649. There is also a Google Tech overview of this on YouTube: https://www.youtube.com/watch?v=w8w-dFrmovQ

Agile Estimating and Planning book by Mike Cohn.   https://www.amazon.com/Agile-Estimating-Planning-Mike-Cohn/dp/0131479415

The Phoenix Project. A must-read for anyone developing or operating systems. https://www.amazon.com/Phoenix-Project-DevOps-Helping-Business/dp/1942788290/ref=sr_1_1?dchild=1&keywords=the+phoenix+project&qid=1629759373&sr=8-1

Videos:

Agile Product Ownership in a Nutshell video by Henrik Kniberg. Covers keys activities in forming a backlog, planning and executing sprints, incorporating feedback loops. This goes beyond just Product Ownership and I often recommend this for someone looking for an introduction to agile.  https://www.youtube.com/watch?v=502ILHjX9EE

An Introduction to ATDD video by Ken Pugh. In less than 10 minutes provides an overview of Acceptance Test Driven Development principles and practices. https://www.youtube.com/watch?v=OweSc3fl4LY

Articles:

It’s Not Just Standing Up: Patterns for Daily Standup Meetings. Helps Scrum Masters understand how/when to vary the format of daily standups, pitfalls to watch out for, and how to keep them fresh. http://martinfowler.com/articles/itsNotJustStandingUp.html

Podcasts:

Meta-Cast. A pragmatic view of agile and teams. https://meta-cast.com

Scrum Master Toolbox. Techniques and experiences from a wide variety of agile practitioners. https://scrum-master-toolbox.org