Yes.
Photoshop supports a maximum pixel dimension of 300,000 by 300,000 pixels per image.
Pixels per inch.
Its the amount of pixels per inch
Filter -> Blur
Dodging is lightening pixels, Burning is opposite.
Replacing and blending pixels at same time.
pixels
Pixels.
Photoshop is an image editing program. Resolution is the term used for how dense an image is pertaining pixels. Photoshop can handle any range of resolution as long as the computer has enough speed and enough RAM (Random Access Memory) to handle large resolution images. Within Photoshop, resolution refers to pixels per a measure of length. In the US, it is usually measure as pixels/inch. In Europe, pixels/centimeter. A pixel is the smallest "part" of an image, so higher the pixel/inch gives the image more detail and "crispness."
To clone means to replace pixels on area where you paint with pixels from sampled (source) area (first you must choose source area).
clone stamp
It is measured in points.