Rails is Hard
But it doesn't have to be confusing. By breaking down each of the advanced concepts, I will introduce you to the Rails "gotchas" that every developer needs to know when just starting out.
Module 1: Testing
By default Rails object associations will create N+1 queries in your app. Understand where your N+1 queries are coming from and how to solve them.
Module 2: Introspection
Module 3: The Big Picture
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Module 4: Magic and Secrets
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Module 5: Antipatterns
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Module 6: Upgrading a Rails App
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Module 7: Rails 7
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Module 8: Debugging
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Module 9: Advanced TDD
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