What is the difference between developer.apple.com and iTunes Connect?

Pergunta

The two sites seem to be related, but I don't understand the conceptual difference between them.

Solução

developer.apple.com is the developer portal with access to documentation, videos, tools etc. required to develop software for macOS, iOS, watchOS etc.
iTunes Connect is the entry portal to the App Store used to manage content on the iTunes Store and Apple Books.