Michael Hartl's Rails Tutorial has been the go to resource for new Rails developers since the Rails 3 days. You also may want to invest in The Rails 5 Way by Obie Fernandez as a reference book. Once you learned the basics, do yourself a favor and read Objects on Rails by Avdi Grim, which while a bit dated is a great read on using proper OOP architecture for your Rails app.
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For a total beginner, is there a go-to tutorial or course or book you could recommend on Ruby on Rails?
Michael Hartl's Rails Tutorial has been the go to resource for new Rails developers since the Rails 3 days. You also may want to invest in The Rails 5 Way by Obie Fernandez as a reference book. Once you learned the basics, do yourself a favor and read Objects on Rails by Avdi Grim, which while a bit dated is a great read on using proper OOP architecture for your Rails app.