Canon A2000 is aperture, telephoto and photosensitive, which are more or less commonly used, mainly shooting people and scenery.

For the exposure combination values of sensitivity, aperture and shutter, there is not a set of universal parameters that can adapt to multiple subjects, and each set of settings corresponds to the current subject one by one, so there is no most universal combination of exposure parameters to take pictures, and there is only one ending: most photos will be overexposed or underexposed, and the brightness of the picture is terrible. Otherwise, photography wouldn't be so profound.

A2000 is indeed a fully automatic camera, so the aperture and shutter speed cannot be customized. But because it is a fully automatic machine, you can set the machine to automatic gear, and then the exposure parameters are set by the fuselage according to the environment at that time, which is the most reasonable and convenient.

For daily use, it is recommended that you turn the mode dial to the automatic position, and the ISO (sensitivity) is also set to automatic. If you can set the upper limit, set the upper limit to 400, so that the fuselage can set its own parameters according to the environment at that time, and the image quality will not be too bad in extreme environments.

As for the focal length (telephoto or wide angle), this is to play the optical zoom function of the camera, that is, zoom in and out. This is to zoom according to your needs, not to say that a certain focal length can be suitable for all shooting occasions, and you can adjust it if you feel comfortable. If it's too much trouble, don't zoom, just shoot.