My SLR is Canon 550D. I am a novice. Please guide me.

When shooting a film, there is no way to play back the photo, so be sure to write down the aperture and shutter used at that time with a notebook to see if it is dark or bright after development. This is a headache and inconvenient problem, but it is lacking in the digital age and is also a good learning method. From experience, there are some rules. It is not necessary to follow, but it may be useful:

Sixteen sunshine rules: ISO, shutter synchronization, F/ 16 (sufficient light)

Moonlight 1 1, 8, 5.6 Rule: ISO, shutter synchronization, full moon with F 1 1, chord moon with F8, new moon with F5.6.

Grey board rule: open your palm to the sun, measure the light, and add one gear.

Rule of depth of field: Pay attention to the front 1/3 of depth of field.

Flash distance rule: distance times 2, sensitivity times 4.

Dynamic capture law: the object moves 45 along the lens axis, and the shutter is 1/250.

Sunset rule: You can measure the first half of the sunset to reduce exposure compensation.

Photography is an art, or painting. Bresson once said that photography is a direct action, which is different from painting in that painting can provide enough time for composition and prediction. Think about the effect before shooting, then write it down immediately and try to shoot. Take a notebook and a camera. Write down all the ideas you didn't catch or suddenly had, and look for them later. Generally, lenses 4, 5.6, 8, 1 1 are the sharpest, but not necessarily. So be familiar with every lens and camera. Go out to take pictures. It doesn't matter if you fail. Now I am familiar with it, two can be exposed very accurately, and one will not be overexposed or overexposed too exaggeratedly. It's just a feeling, and there is no special reason or experience.