Wondering what happened to the numeric battery percentage indicator on the iPhone X? The notch takes up enough space at the top of the screen that there was room only for the battery icon, which can be hard to interpret. If you want to see precisely what percentage of your battery is left, swipe down slightly from the top-right corner of the screen. That gives you the full set of indicators, including battery percentage. You don’t have to keep swiping down enough to show Control Center, but if you do, all the indicators will be there too.
Since the iPhone X lacks a Home button to press twice for the app switcher, you’ll need to switch apps in a new way. To bring up the app switcher, swipe up from the bottom of the screen to about halfway, and then pause until the app thumbnails appear. Then you can scroll through your launched apps by swiping horizontally and switch to an app by tapping its thumbnail. While in the app switcher, you can also force-quit a frozen app: press a thumbnail to get a red minus button and tap that button. Alternatively, you can skip the app switcher entirely. Instead, swipe right on the very bottom of the screen to switch to the previous app—swiping left switches to the next app.