2. Setting up Firebase

[byzantinist]

Grammar issue (missing apostrophe in contraction):

In reality, its much more complicated than that, often because applications require specialized business logic.

should be:

In reality, it's much more complicated than that, often because applications require specialized business logic.

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Next we'll need create a new Xcode project!

should be

Next we'll need to create a new Xcode project!

[ocwang]

Good catch. Fixed, thanks!