I am a Magento backend dev, which Claude Code learning path should I start with?

If you already ship modules, start with the Intermediate path (admin grids, REST and service contracts). It anchors on the three things every Adobe-style PR is judged on: Api/ + Api/Data/ interfaces, a Repository implementing the interface, and DI preference/plugin wiring in etc/di.xml. Spend the first 5 days re-implementing one of your existing modules with strict service contracts; have Claude Code review each commit against phpcs --standard=Magento2 and phpstan --level=6. New to modules? Do the Beginner path first. Move on to the Advanced path (plugins, observers, GraphQL, MFTF) once you can build a working REST CRUD without looking at docs.