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Depends on the future aspects I am seeking. If it is just about getting up to the pace of DevOps, I would go for the most used platform; though All are useful.

Also, as a FrontEnd dev, I am not really sure if many things would change about how they operate.

As many things are moving toward more and more automation; Docker, Kubernetis etc are there to orchestrate the Server, wouldn't it be making more sense in doing Certification or the courses on these Automation tools?