depends on what you are printing and what it is for but "resolutions" are used for digital purpose and not relevant with print.
Print uses inches like if you are printing a poster on a standard size sheet of paper then you would make the canvas 8.5" x 11".
There is one VERY important aspect of using Photoshop for print and that is the canvas DPI. Print projects should be set somewhere between 150DPI - 300DPI. This depends on the project's purpose but with print, larger the better.
Web/Digital = 72dpi
Print = 150dpi - 300dpi
Any time you want to reproduce (print) an image it would be a good idea to use a high resolution file. Have you ever tried to print out an image that is off the internet? Most of those images are only 72dpi. They look fine on your monitor where your eye fills in the bumpy parts, but just try printing them out at least 6 inches wide and... yuck!
Its the amount of pixels per inch
PSD is native Photoshop format and supports most of Photoshop editing capabilities. You can send to some (not to all) printing companies PSD files. Otherwise save file for printing purpose as PDF or TIFF.
Image > Image Size
Adobe Photoshop is the best tool to use in case of digital image correction and editing. For use of images in digital offset printing be sure that your image is in print mode (CMYK) so that the colors will separate properly as in the case of offset printing. Helpful hint: only convert the image to CMYK when you are nearly finished editing the image for print- that way you have more access to the tools in your image editing software such as Photoshop.
Use the crop tool. After selecting the Crop Tool, set your desired dimensions in the Width and Height boxes at the top of the screen. (Enter 25 px in each box). The Resolution also needs to be set dependent on what you intend to use the photo for after cropping. Printing or email/website usage. Printing requires a higher resolution (300dpi) while email/websites don't (72dpi).
I always use PDF when printing out work, especially graphics from Photoshop, Illustrator, or InDesign. Mainly because it is a universal format and it will be sure to print the way you need it.
Use the Image Size command.
Adobe Photoshop would be great for editiing and printing photos, but you may want to consider Adobe Photoshop Elements.
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."
Everywhere in the World, Photoshop is best image manipulation software and can be used for wide variety of tasks: printing, web, design..
There are a lot of programs that can help you with high quality printing. The best program for anything to do with photos is Adobe Photoshop. It can help you with all your picture and printing needs.