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As a beginner you have tons of options!
As I said this is my opinion based on 25 years working in software, but there are plenty of people who will argue for Ruby. I think Ruby's great, but if I were starting fresh, I'd play the numbers and go for the greatest number of jobs in your area. Just go to any of the job sites like Career Builder and put in your zip code and check how many jobs there are for each of the tech stacks. Your area may not have the same breakdown as mine, so check for yourself.
Hope that helps!