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Module 1 Challenge (Reading List)

For the Module 1 Challenge (Reading List) do I need to create my own Firestore Database and replace the GoogleService-Info.plist file?

Yes. You are creating a new project that will have a different Bundle ID and you need to create your Firebase project using that Bundle ID which will mean that the GoogleService-Info.plist is tailored to that project BundleID. Everything is unique.