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InfluxDB
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After that, I recommend starting with Ruby on Rails, the framework you'll use most likely as a professional Ruby developer. For this, I recommend starting with The Agile Web Development with Rails book and also Michael Hartl's Rails Tutorial book. These two should give you a good introduction to Rails. Finally, for a deeper understanding, I recommend reading the latest edition of The Rails Way by Obie Fernandez.
A lot of book were mentioned l, if you want to pick some more, try here https://planetruby.github.io/books/
Try https://try.ruby-lang.org/ for half an hour to see if you get the hang of it.