If you have lost only your widget on Home Screen you can add it easily. Just follow these steps which I extracted from this article. If you want to know more read it.
Locate the Camera app in your App Drawer. (Swipe up on your home screen, beginning the swipe an inch or so from the bottom of the screen.) Press and hold the icon, then drag and drop the icon to your home screen.
Change settings quickly on your Android phone Find & delete files on Android Add apps, shortcuts & widgets to your Home screens Get to know your Android phone Learn how to use your Android device and get the most out of Google. Get step-by-step guides and instructional videos on how to set up your phone, customize your settings, and use apps.
To quickly get to your favorite content, you can customize your Home screens. You can add and organize: Apps Shortcuts to content inside apps Widgets that show information without opening apps
In Discover, you can add widgets like weather, stock prices, and prayer times to display above the rest of your Discover content. The Weather widget is already on your Home screen by default.
Some Android devices have a search bar on the Home screen so you can search the web without a separate app. If your device doesn't have a search bar automatically, you can add it as a widget.
Related resources Add apps, shortcuts and widgets to your home screens Find, open, and close apps Quickly change settings Use gestures on your phone Give feedback about this article Choose a section to give feedback on
To check your upcoming events and meetings from the home screen without opening the Google Calendar app, add a widget. Add the Calendar widget to your home screen Important:
At the bottom or side of your screen, there's a row of apps called the shelf. If there's an app or web page that you use frequently, you can pin it to the shelf for quick access. You can't add apps and shortcuts to your desktop's wallpaper or background. Add, change, remove, or hide apps in your shelf Add an app to your shelf
