How to shoot Canon 550d at night?

Judging from your question, you obviously don't understand. There are many settings in the p file that need to be done manually. If you don't understand, it's difficult to take photos with correct exposure.

I suggest you use automatic transmission, which is automatic transmission. The logo on the 500D turntable I use is a green box. I wonder if 550D is the same. Using automatic gear, the camera will automatically determine the appropriate aperture shutter and set it automatically, so it can take pictures under normal circumstances. Night view is fine.

In order to get better results, if you shoot people at night, you can use the "night portrait" mode on the turntable, which is the sign of a star+a villain; If you shoot scenery, choose the "scenery" mode, which is a sign of a mountain. When shooting at night, the exposure time will be prolonged due to the dark light, so the camera must be kept stable, otherwise it will be blurred. The best way to stabilize the camera is to use a tripod. If not, you can take materials nearby and put the camera on a stable plane to shoot, such as railings and steps. You can also use a fixed object to support your body or arm, and try to avoid the camera shaking.

When you say flash, the camera will detect that the light is too dim and automatically fill the light with flash to focus. The reason why it can't be photographed may be that the camera can't find the subject and then can't focus, so it can't be photographed.

I suggest that when you press the shutter, press the shutter in half first. After hearing the beep (indicating that the camera has completed autofocus), you can also see the relatively complete indicator light in the viewfinder (optical viewfinder, lower side), and then press the shutter to the bottom to give the camera enough time to focus, otherwise it is easy to lose focus in some special cases.

Considering that you don't know much about photography, don't use M file because you don't know how to set it up at all. Including m, p, Tv and Av.

Several gears above the automatic gear need to be set manually. If you want to learn photography, you can read the instructions and photography books carefully, which will be introduced in detail, otherwise it is unnecessary to use these.

However, I suggest you read through the instructions. Even for ordinary users, it is very helpful to read it once.