What kind of aperture lens should beginners choose?

If you need shots according to the topic and effect, you'd better prepare more; Otherwise, we should consider how to maximize the performance of the lens.

For scenery shooting, the aperture of F8 is generally enough; If you take a portrait, a large aperture can better blur the background. However, it should be noted that the lens has its best aperture. For a dog head like 18-55, the imaging of the maximum aperture is somewhat unsatisfactory. This requires a choice. You can try it sometime. You can shoot with the aperture of 18-55 in the same environment to see if the final imaging is available.

For day and night, the aperture used is different. The former is often more flexible and can have many choices. The latter is relatively poor, and the optional aperture is often limited. Unless you are shooting a still life, you should consider the shutter factor, which is also related to ISO, but the aperture can't be too small, otherwise the shutter can't keep up, and sometimes you need a flash to fill the light to get a proper exposure.