For selfies, the Samsung device allows you to enable the "Tap screen" function, which allows you to take a photo by simply tapping on a free area on screen.

Android 10 | One UI 2.0
Step 1:  Open the  Camera app
Step 2:  Open the  Settings
Step 3:  Tap on  Shooting methods
Step 4:  Enable or disable  Tap screen
  1. Open the Camera app
  2. Open the Settings
  3. Tap on Shooting methods
  4. Enable or disable Tap screen

Samsung Instructions