Is there a spec or an Apple document that describes Photos in more detail than what's on Apple.com at: https://www.apple.com/osx/photos/ ?
iMac (21.5-inch Mid 2010), OS X Mavericks (10.9.5)
I'd like to read the details before I make the big leap from iPhoto to Photos, as I have a fairly large library with a lot of edited pictures. I'd like to find out what features are there and what isn't.
I have not read this book yet, but the series is usually very good:
"Photos for Mac: A Take Control Crash Course," penned by Jason Snell, formerly of Macworld and now at Six Colors.
Buy it for $10 > http://tid.bl.it/photos-crash-course-cart
Get more info > http://tid.bl.it/photos-crash-course-info
Get started with Photos for OS X
Use Photos and iCloud Photo Library on multiple Mac computers
Find out how much iCloud storage you need for your Photos Library on your Mac
Open Photos with a pic or two to work on. Select an image and double-click to open it in large view. Click on the Edit button on the top right. Now you can examine all the available editing tools.
Where can I find a complete list of editing tools in Photos?
