How to shoot in aperture priority mode correctly

In short, then:

To successfully shoot in aperture priority mode, set the aperture to the desired depth of field and check the shutter speed selected by the camera to eliminate blur when shooting handheld or call

It’s enough.

In poor lighting, the camera will choose a too slow shutter speed, which will lead to blurry pictures or shake.

The shutter speed when shooting running children and fast dynamic sports scenes should not be longer than 1/350 sec.
Static subjects in aperture priority mode are shot using the rule of one to understand the minimum shutter speed when shooting handheld.
What does this mean?

This means that the shutter speed cannot be longer than one divided by the focal length of your lens.

For example.

For a 50mm lens, the minimum shutter speed for handheld shooting is 1/50th of a second. At a slower shutter speed, like 1/15, you will get motion in the frame or blur.

Depth of field in aperture priority mode
Av mode operates with depth of field. All you need to do is set your aperture to the desired depth of field.

Depth of field is a fundamental concept in photography and its description is beyond the scope of this article.

I will give a short list of apertures that are used when shooting certain scenes.

Bust or face portrait shot at f/1.4 to f/3.5
When shooting full-length and paired portraits, use an aperture of f / 5.6
Landscapes or architecture are shot at apertures from f/8 to f/18

The numbers are rather arbitrary, but as a guideline they are quite suitable for a beginner.