How to use an iPhone?

This user guide would be a good start. Let us know if you have specific questions.

iPhone 11 Pro Max - Apple Support

Here's a general overview of using an iPhone 11 Pro Max with iOS 15:

1. Set up your iPhone: Power on your iPhone and follow the on-screen instructions to set up your device. This includes selecting your language, connecting to Wi-Fi, signing in with your Apple ID, and configuring settings like Face ID, Siri, and iCloud.
2. Home Screen and App Library: The Home Screen is the main screen where your app icons and widgets are located. You can swipe left and right to access different app pages. On the far right side of the Home Screen, you'll find the App Library, which automatically organizes your apps into categories.
3. Control Center: Swipe down from the top-right corner of the screen to access Control Center. This allows you to quickly access various settings and features like Wi-Fi, Bluetooth, volume control, screen brightness, and more.
4. Notification Center: Swipe down from the top of the screen (except for the top-right corner) to access Notification Center. This displays your recent notifications, widgets, and other useful information.
5. App Switcher: Swipe up from the bottom of the screen and hold to bring up the App Switcher. This allows you to switch between recently used apps or swipe up on an app preview to close it.
6. Face ID: iPhone 11 Pro Max uses Face ID, a facial recognition technology, to unlock your device and authenticate various actions. To use Face ID, simply look at the front-facing TrueDepth camera and your iPhone will unlock if it recognizes your face.
7. Widgets: Widgets provide at-a-glance information and can be added to your Home Screen or Today View. To add a widget, swipe right from the Home Screen or Lock Screen, scroll to the bottom, and tap "Edit." Here, you can customize your widget layout.
8. App Library: The App Library organizes your apps into categories and allows you to access them easily. Swipe right from the last Home Screen page to access the App Library. You can search for apps or browse through different categories.
9. App Clips: App Clips allow you to quickly use a small part of an app without installing the full app. When you come across an App Clip, you can launch it from a website, QR code, or other sources to perform specific tasks.
10. Siri: Activate Siri by either saying "Hey Siri" or pressing and holding the side button. Siri can help you with tasks, answer questions, control settings, and more.

Please note that these instructions are based on iOS 15, and the features and user interface may change with future iOS updates. It's always a good idea to explore your device's settings, features, and refer to Apple's official documentation for the most up-to-date information on using your iPhone 11 Pro Max with the latest iOS version available.