For many entry photographers, when coming across a photo with a blur or sharp object may be attractive. Shooting photos with a blur may be one of the best reasons to get a DSLR or mirrorless camera. This effect is called Shallow Depth of Field.
If you inspect your camera, at the top of the camera you might find a dial with the words "P/A/S/M/Auto"
For entry photographers, understanding White Balance is extremely useful to deliver the desired feeling of the photo.
No matter what experience level, you should understand “Minimum Shutter Speed” or “Safe Shutter Speed”.
If you want to expand your knowledge about controlling your camera, A/AV-Mode is the best for entry level photographers.
If you are an entry photographer that wants to improve your photo. There are three things you must fully understand- Aperture, Shutter Speed, and ISO.