After reading this article https://www.howtogeek.com/howto/18249/take-snapshots-of-your-favorite-movie-scenes-in-vlc/
I noticed one trick was left out. Even though yjat thread is closed, I think this worth sharing.
Shift + S
Option 1- Hold Shift key down and press S key once for single snapshot
Option 2- Hold Shift key down and press S key repeatedly for multiple snapshots
Option 3- Hold Shift key down and hold S key for continous snapshots