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Migrating from frontend to backend web development

I mostly do front end web development but I want to shift to backend web development.

I have some experience with backend development. I developed a basic website using Ruby-on-Rails but I didn't 'get' a lot of stuff; I just did it because some tutorial or screencast said so. Basically I somehow hacked it together. So, I understand MVC pattern and have some idea about backend development.

However, I want to learn backend developmet, so that I can develop a production quality dynamic database-driven web applications. What should be the roadmap?