Cases that need to be learned in the world of photography:

1. Composition Principle
   In the composition principle, there are some things that need to be in the know like framing techniques, the main subject position, maintaining that containers and interesting backgrounds, use of color in the picture, the concept of balance between elements and also other related case  storytelling images.
2. Selection of lens
   Use the right lens will affect how visual images. Each lens also has the task and different qualities.
3. The use of ISO
   ISO is the sensitivity level of the light sensor in the camera. Most digital cameras have an ISO from as low as 50 to 3200. DSLR for professionals can achieve ISO 6400 and 25600. ISO low, like 50, 100, 200, usually used in an atmosphere of light and have adequate lighting. ISO 400 to above are usually in use in the home or in the dark.
4. Digital Darkroom Techniques
   Digital darkroom technique is the process of editing images using computer ilke photo shop, paint shop pro, gimp, and more. Between the normal process to do was brighten the image, cropping, dodging and burning, sharpening, contrast correction, color correction and white balance, editing typical impressions and so forth.
5. Retouching
   The process of retouching is the process of converting the image fits like to remove acne, and so forth.
6. Image of Black & White / Monochrome
   Black and white images can be generated from hold the camera or by using the digital darkroom techniques. This process is very easy in a digital world
7. Filters
   There are some filters that needed in the digital world. The most important filter is the UV filter. UV filter will reduce haze in the picture and should keep the lens from  penetrated the dust, moisture and dirt. Filters are important also is Circular polarize filters. Filters that can help get the blue sky and may eliminate the baying-shadow in the water. Close-up filter may help reduce the distance focusing and helps us take a macro picture.
8. Focal Length
   Focal length of lens give clues to the aperture angle lens and Size image relative to the object. Mark the normal focal length in millimeters or mm.