The First Quarter Moon is a primary Moon phase when half of the Moon’s face is lit up. Whether it is the left or right half depends on where you are on Earth.
https://www.timeanddate.com/astronomy/moon/first-quarter.html?fbclid=IwAR0qLO05-qQfXCHbtgs2sSuEwrDbof5u1UdamsxrDrT7Hs6RZzeS6dVARYE
