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The Home screen is your primary feed with posts and photos from all the people you follow.
In your profile you can view all your posts and photos, but you still can't edit your profile details from within the app.
Google+ gathers your photos as you take them on your iPhone to get them ready for upload. It's your choice whether you upload them, but it's definitely convenient to have them all there.
In the Events section you can create a new event on the spot. Set the date, enter the location, and start inviting friends to your event.
In the top-middle of the interface, you can touch a button to sort posts by one of your circles or simply view them all.