Yes.
Photoshop supports a maximum pixel dimension of 300,000 by 300,000 pixels per image.
The recommended unsharp mask settings for enhancing image sharpness in Photoshop are typically a radius of 0.5 to 1.5 pixels, an amount of 50-150, and a threshold of 0 to 10. Adjusting these settings can help improve the overall sharpness and clarity of an image.
Pixels per inch.
Filter -> Blur
Its the amount of pixels per inch
Dodging is lightening pixels, Burning is opposite.
Replacing and blending pixels at same time.
pixels
Pixels.
clone stamp
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).