Double Exposure is when you take two photos and one is visible while the others opacity is lowered to create an image on top of an image.
Sepia is mostly used for old-fashion pictures. Sepia is when you add tint to a black and white picture to give it a warmer tone.
Black And White
Like the title says black and white is when you make a picture black and white!
Emphasis is having a non-colored image or black and white and then only coloring in one object giving it emphasis.
A silhouette is when any object or living thing is in-front of a sun. This makes it so the back of it looks totally black and then you take a picture of it.
Boat n' Hand
Boat N' Hand is an optical illusion type of photo. Like if someone took a picture of a cloud behind a statue of a trumpet. It could look like the statue is blowing out steam from the trumpet.
Rule Of Thirds
The rule of thirds is when you split a picture into nine even spaces. Then you take your picture and the center square and in each corner of the square should be a different focal point.