Hold your breath when you press the shutter, first press the shutter half to focus, and then press the shutter bit by bit when you feel that it will not shake. The photo blur is not necessarily caused by shaking hands, but may also be caused by inaccurate focus. The shutter of a digital camera is basically auto-focusing (except manual focusing) when the shutter is pressed halfway, and then pressing it to the bottom to take pictures.
If you press it directly to the end, there will be no focusing process and the photo will be blurred.
In addition, when the light is dark, if you don't need a flash to fill the light, you should increase the sensitivity, which can also improve the shutter speed and reduce the jitter coefficient.
If you use a tripod, you should generally use the 2-second self-timer function to avoid camera shake when you press the shutter.