Photoshop is mainly a photo editing program used to enhance existing images. You can create from scratch, do basic animation and even edit video if you need to. The program understands a wide variety of file types.
It is important to understand these items when working with PS:
Shortcut keys - make tasks quicker
Layers - it's just how PS works! Don't fight it!
Opening images/ saving images
Cut and paste - just what you think!
Concept of the brush tool - not just for paint
Photoshop is a raster (pixel) editor. By default you work in a RGB color mode, but you can switch to CMYK if you are planning to print.
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