Why sometimes my green light always on?
Sometimes after I make a video call my green light is always on why is that.
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The green light indicates that an app has used, or is using, your camera. This is completely normal during and after a FaceTime call, or a video call via e.g. Skype or Zoom.
The green light disappears automatically after some time. Alternatively, you can close the app that used or uses your camera. You can also see which app has used your camera by pulling down the Control Center and looking at the top.
You can find more information here:
About the orange and green indicators in your iPhone status bar - Apple Support