You'll also want to learn about and understand:
[*]photo editing (parametric/non-parametric, raster/vector, scene-refered/output referred)
[*]post production techniques and workflow (from image ingestion to final output use type)
[*]image file management (browser and/or database)
[*]color perception
[*]color management
[*]color bit depth
[*]PPI (pixels-per-inch for digital image files)
[*]DPI (dots-per-inch, if you make your own prints because it is a printer specification and differs between printer types. DPI is not the same/nor equivelent to PPI)
[*]dithering and print size
[*]color spaces
[*]color space conversion
[*]gamma correction and digital color tones
[*]edit working space color space considerations
[*]computer display types and calibration
[*]soft-proofing
[*]ICC profiles
Prints are very different from a computer display, because a print is a reflected light medium, while a computer display is a backlit, or projected light, medium.
Consequently, images destined for print get edited differently than images destined for electronic, or backlit, display.