DevOps Fundamentals Ideas for the new Domain 5 in the Version 004.

Great topic Michael!

A resource that I found very useful was this from Altassian. Agile development and Devops methods are compatible but not the same thing.

This article walks through both agile development (the agile manifesto) and introduces a couple of the sources of Devops methodology (the Devops three ways).

The meaning of DevOps has changed dramatically since Werner Vogels originally started the idea back in 2006 with "You build it, you ship it."

It originally meant putting more and more shipping responsibility in the hands of developers - this came in the form of a few frameworks like Ruby on Rails and Heroku, but was really popularized by the Docker container model, which led to the split from the original term.

As container development practices matured, DevOps became more associated with development types that placed "most" deployment in the hands of developers (this later became known as GitOps), and Site Reliability Engineers (SREs) became the role that handled the stuff that developers really couldn't do in larger projects, such as fancy orchestration (e.g., Jenkins and large scale Kubernetes) as well as monitoring (e.g., Prometheus/Grafana), security (e.g., Stackhawk, IAM), and end-to-end solutions (e.g., OpenShift).

Today, DevOps is less understood as a term than it original was - but in general, it's used to denote developers who have some experience with some forms of deployment-related activity.

For Cloud+, I'd personally recommend focusing only on SRE-style topics and from that viewpoint, given the audience for the certification.
My two cents