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How to turn on iCloud Photo Library

I lost all my notes that outlined what my son needed to do to make his phone automatically down load all his photos to the cloud.  Remember we were leaving mine to manually plug in.
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While I can't remember the exact conversation, I think this is what you want to do…

On his phone, go to settings. Select iCloud/photos. Turn on iCloud Photo Library. Select to optimize the library. Do not choose to download originals. In the same list, also turn on Photo Stream and iCloud Photo Sharing. There's not much need to turn on Burst Photos. From that point forward all his pictures on his phone and all his pictures on the iMac will merge together in the cloud and each device will receive thumbnails or originals of all pictures. iMac will get originals. iPhone will get thumbnails.
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