To install an APK file, use the following command:
adb install path/to/apk/file.apk
or if the app is existing and we want to reinstall
adb install -r path/to/apk/file.apk
To uninstall an application, we have to specify its package
adb uninstall application.package.name
Use the following command to start an app with a provided package name (or a specific activity in an app):
adb shell am start -n adb shell am start <package>/<activity>
For example, to start Waze:
adb shell am start -n adb shell am start com.waze/com.waze.FreeMapAppActivity