Here are some of the best iOS 9 tips and tricks that I have found since it’s introduction.

• ​Proactive Assistant – New search feature accessed by swiping right from the home screen. You can turn it off in Settings> General> Spotlight searching
• Keyboard – Many folks complained about the inability to tell whether the “caps” key was engaged or not. So, Apple gave us a keyboard with lower case letters by default. When you tap the “up arrow” on the left, the keys change to upper case.  You can change the keyboard back to display upper case keys all the time by going to Settings > General > Accessibility. Scroll down to “Keyboard” and tap there. Under Software Keyboards it shows a button next to “Show Lowercase Keys. Tap it off to return to all caps all the time.
• Button Shapes – Go to Settings > General > Accessibility. Scroll down to “Button Shapes” and click on the button there. If you look at the top of the screen as you tap it, you will see a grayed area appear behind the text “General.” The grayed area will now appear behind many of the text buttons throughout your OS. For instance in Calendar app the text buttons on the bottom of the screen “ Today”, “Calendars,” “Inbox” will now show that grey background behind them making them standout from the white background.
• Larger Text – Just tweaking up the size of the text displayed on the iPhone can really make a big difference when taking a quick glance at Contacts, Mail or Messages or overall system text. On your iPhone or iPad, go to Settings > General > Accessibility. In the Accessibility screen scroll down to Larger Text and tap there. A new screen appears with a sliding button that scales up or down for size of text. It is set in the middle by default, but you can actually see the text on the screen above the slider grow larger as you move it to the right. I set mine just one “tick” to the right of middle. If you click on the Larger Accessibility Sizes, you’ll see even larger text settings.
• New notes – The Notes app has always been great for jotting down your thoughts. And now it’s great for so much more. Want an easy way to make a checklist of to-dos? Consider it done. Or add a photo, map, or web link to a note. You can even draw a sketch with your finger. And thanks to iCloud, changes to your notes will be updated across all your devices and on iCloud.com.
• Public transit in maps – Now you can use public transportation with Maps as your guide. In select cities around the world, a new Transit view shows you lines and stations for subways, buses, trains, and ferries right on the map. When you plan a route, every step of your trip is laid out from point A to point B.  Not yet available in Missouri.
• Shortcuts in maps search to nearby places – with the Nearby feature, it’s easier to see what’s around you and decide on places to shop, eat, and more.
• Low-power mode – Across the entire operating system, apps and key technologies have been made more efficient to trim battery usage wherever possible — so you get more battery life for the things you do every day. Thanks to ambient light and proximity sensors, your iPhone knows if it’s facedown on the table and prevents the screen from turning on, even when you receive a notification. The new Low Power mode lets you extend your battery life even further.settings battery – also see what apps are using your battery
• News app – iOS 9 adds a new app to your Home screen. News puts all the stories you’re interested in, all in one place — so you don’t have to hunt through different apps and websites to make sure you’re not missing the next big story. Articles are pulled from a wide range of sources, from top news organizations to indie publications. Stories are chosen for you based on what you like to read, and the more you use News, the better it gets at picking out just what you’ll want to see
• Wallet app replaces passbook – Use Apple Pay to securely and easily make purchases with your credit cards, now including Discover. You can even access Wallet by double-clicking the Home button when your iPhone is locked. Soon you’ll be able to use store credit cards, like Kohl’s Charge or JCPenney Credit Card. And you’ll be able to add rewards cards, like Dunkin’ Donuts DD Perks, Walgreens Balance Rewards, and MyPanera, to your Wallet app and receive and redeem rewards
• New Wallet Features – Double-click from off to pay with wallet or choose a different card
• New App navigation – Link back to where you came from with “back to”
• iCloud drive application – The new iCloud Drive app built into iOS 9 allows you to access any file you save to iCloud from just one place — right on your Home screen. Easily search within the app and find the file you’re looking for. Browse all your files by date, name, or any tags you added on your Mac. You can also preview and organize your files without leaving the app.
• Find my phone and find friends preinstalled
  
• Set a reminder about what’s on the screen – Say remind me about this to Siri
• New Siri preferences – Turn on hey Siri, Silence Siri, and have it learn your voice
• Slide Over – Now you can open a second app without leaving the one you’re in. So you can quickly browse the web, respond to a text message, or jot something down in a note, then slide that app away and get back to the one you were using before. (iPad only)
• Split View – With Split View, you can go a step further and have two apps open and active at the same time. Work on a sketch with the reference photo beside it. Or write a paper while copying citations from a book in iBooks. When everything you need is right in front of you, it’s easier to focusSearch inside settings (iPad 2, iPad Mini 4, and iPad Pro only)
• Picture in Picture – While using FaceTime or watching a video, press the Home button and your video screen scales down to a corner of your display. Tap to open a second app, and your video continues to play — even while you use the other app. So keep watching your favorite TV show while you reply to the email that just came in. (iPad only)
• Wi-Fi assist in settings cellular – Allows you to use Celular for data when Wi-Fi fails (Uses data from your celular plan)
• Six digit passcode -Keeping your devices and Apple ID secure is essential to protecting your personal information — like photos, documents, messages, email, and so much more. iOS 9 advances security by strengthening the passcode that protects your devices
• Quickly trash all mail – hit edit button to trash all
• Add attachments in mail – Press and hold to add attachments from iCloud Drive.
• Better upgrading process – iOS 9 does even more to efficiently stream new updates to your device without having to first download and unpack them — which means you don’t need as much free space to update
• Disable shake to undo – in accessibility
• Check Your battery in Notifications and Widgets – Pull down from the top of the screen
• Pinch to zoom in video – When watching some supported video, you can now pinch to zoom in
• New smart albums in Photos for selfies and screenshots
  
• Directly select photos by gliding over with your finger
  
• Hide photos in your photo library – Hide tyhose photos in your library you dont want others to see when they look at your device
• Request safari desktop site and turn off content blockers on the fly – by pressing the reload icon.
• Quicktype – Shape up your text in no time with an all-new Shortcut Bar, convenient editing tools, and a handy new way to select text with Multi-Touch gestures. And now when you use a wireless keyboard with your iPad, you can enjoy even more keyboard shortcuts. You can even use your on screen iPad keyboard as a mouse!
• Safari Content Blockers – Safari content blocking extensions don’t automagically identify ads and prevent them from loading. Instead, they identify elements and resources on a web page and can, optionally, hide those elements and prevent those resources from loading. The goal is to show how fast the modern web—read: Safari—really is when you remove all the extraneous code that’s been dumped on top of it.
• Find on the page in Safari – Safari has a Find in Page feature, although it’s a bit hidden. To perform a search for words on the current page, tap the address bar and type your search. Tap the Find option under On This Page at the bottom of the list to search the current page
• Safari Reader Enhancements – Customize safari reader mode with color and font and Background