Q: Where can I learn about new features of iOS 9.3?

I get far more information for using my friend Google than what Apple provides when I find myself in your situation. Enter this into a Google (or Bing or Yahoo or whatever you use) search and you will come up with a bunch of informative articles.

"about the new features in iOS 9.3"

Maybe if you listed the features that you want to know about, we can help you find that specific information.

The official iOS 9.3 Apple page: http://www.apple.com/ios/updates/

Night Shift: Settings > Display & Brightness > Night Shift (Please note that this is not compatible with the iPhone 5C)

Notes Protection: Settings > Notes > Password

To lock a note, press the share button in a note. (The icon with an arrow pointing out of a box)

Health new activity dashboard: Health app > "Heath Data" tab > Fitness > Activity > Show on dashboard (Please note that this only works if you own an Apple Watch)

News, Carplay, Education (I'm sorry, I can't help you with this because it's not available in my country)

If you have anymore questions, please let me know. Cheers!

http://www.apple.com/ios/whats-new/

Below each section you will see a "Learn More" link.

I do notice in your signature you have stated that you have an iPhone 5c. Just be aware that if you are looking for Night Shift, you need to have the iPhone 5s or newer in order for it to work. Night Shift is not available on the iPhone 5c.

I really don't care about the new features in 9.0.3, what did Apple fix in 9.0.3, where can I find that.   iphone 6s

Apologies, this discussion was meant for catox513's question.

This may be the articles you were looking for:

Download iOS 9.0 - 9.3 Information

About the security content of iOS 9.3 - Apple Support