Distinguishing Docker Training Options from Red Hat

Hello All,
I have been looking into Docker training from Red Hat and there seems to be a few overlapping options.
Option 1: RH270 Managing Containers with Red Hat Enterprise Linux Atomic Host
Option 2: DO276 Containerizing Software Applications
Option 3: DO280 OpenShift Enterprise Administration
DO270 Does not have an associated exam
DO276 Leads to Exam EX276
DO280 Leads to Exam EX280
So based on above:
1. Wanted to know of anyone has any opinions on which of the above would be a good starting place.
2. Wanted to know if anyone has any non- RedHat suggestions
I have been looking into Docker training from Red Hat and there seems to be a few overlapping options.
Option 1: RH270 Managing Containers with Red Hat Enterprise Linux Atomic Host
- Install and manage Red Hat Enterprise Linux Atomic Host
- Manage Linux containers
- Build custom container images with Dockerfile
- Publish container images with a private Docker registry
- Deploy multitiered containerized applications with Kubernetes
- Troubleshoot Red Hat Enterprise Linux Atomic Host
Option 2: DO276 Containerizing Software Applications
- Creating containers using Docker
- Working with image registries
- Providing persistent storage to a container
- Creating new images using Dockerfiles
- Implementing image design recommended practices
- Linking containers
- Orchestrating containers using Kubernetes
- Provisioning development and testing environments with Vagrant
Option 3: DO280 OpenShift Enterprise Administration
- Container concepts
- Configuring resources with the command line interface
- Building a pod
- Enabling services for a pod
- Creating routes
- Downloading and configuring images
- Rolling back and activating deployments
- Creating custom S2I images
- Comprehensive review
DO270 Does not have an associated exam
DO276 Leads to Exam EX276
DO280 Leads to Exam EX280
So based on above:
1. Wanted to know of anyone has any opinions on which of the above would be a good starting place.
2. Wanted to know if anyone has any non- RedHat suggestions
Comments
I currently have a considerable amount of knowledge, none of it unfortunately in docker
I was looking for something that isn't Red-washed i.e. a more community/vanilla docker choice. DO280 seems to be quick tailored to Red Hat
Think I will try and go down the 270 (Red Hat Atomic) route first .. it appear's I have entitlement to download and try it out.
My company also want to be getting familiar with the Docker so I am in progress of learning as a newcomer. Do you have any idea on finding some resources like books, free online courses?? Personally I prefer book than online courses
https://access.redhat.com/documentation/en/red-hat-enterprise-linux-atomic-host/7/single/getting-started-guide/
Seems a good guide to getting it all up and running.
RHEL Atomic host is a custom image and has its own features and properties.
If you want to get into Containerized environment, DO276 is your best friend. Then do DO280.