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I don't think the Rails Guides mention Devise, the authentication gem, which is pretty important if you want create a public facing website with users. The devise documentation is pretty good though. Again, a little bit of a learning curve, but once you learn it you can add user authentication to your site pretty quickly.

https://github.com/heartcombo/devise#getting-started

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You don't need devise, so I think it's good it's not included. It used to be that devise was good to use as it had the best practice way to set up the password fields etc. But that has been moved to rails core. It's still worth reading the devise documentation, but I'm so familiar with how it sets things up I can just set it up manually faster than messing around with devise itself.

It's not in the guide because it's not core Rails. But there is a great site called RubyToolbox to help you find things that aren't core Rails. https://www.ruby-toolbox.com/categories/rails_authentication

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