The most important is knowing and understading ruby code because ruby is different from other language Rails is just a dsl on top of ruby so I would reccomend learning ruby most and foremost
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Given that release 6 have just been released,
railstutorial.org
pragmaticstudio.com/courses/rails
hellorails.io
pragprog.com/book/rails6/agile-web...
The most important is knowing and understading ruby code because ruby is different from other language Rails is just a dsl on top of ruby so I would reccomend learning ruby most and foremost