How to Make a Christmas Tree Pop up Card (Robert Sabuda Method). One of the first things that herald in the Christmas season is greeting cards. You can easily make your own pop-up Christmas tree card to send to family members and friends.
Shutter Speed aka (exposure time) , stands for the length of time a camera shutter is open to expose light into the camera sensor - is one of the three pillars of photography, the other two being ISO and Aperture
Learning even just the basics of photography takes a bit of work and one of the more complex ideas is the relationship between ISO, aperture, and shutter speed. Lifehack has a graphic that helps make sense of it.