Merging Layers, exposure, feathering

Open two photos in photoshop, click on one photo using move tool, drag it unto the other tab and then drag back down into the image so one is on top of the other.

Blending:
Go onto layer, there are various types to change the image in blending mode


Command T = resize image
shift = keep proportion

Images are just made up of numbers, mainly 0 and 1

To zoom in and out Command and + or -

Go to Edit, Transform and perspective to change the shape of the image

Exposure to create shadow

Properties - mask - feather to soften edges