Photography Tutorial For Beginners: Aperture, Shutter Speed, ISO
If you break down your photography into bite sized portions and essentially strip it down to the fundamentals then you really will not have a problem creating more professional photos tailored to exactly as you would like them.
This video is a great learning resource as it is clear and presented in a way that is easy to follow and highlights the three things which affect the exposure of a photograph and these are the aperture, shutter speed and ISO. If you can strike a perfect balance between these three elements you can almost guarantee that you will achieve the right look for the type of photo that you want, as well as getting the correct exposure.
In short the aperture affects the amount of light that comes into the sensor and the depth of field and it is this depth of field which will determine how much of the image is in focus.
The shutter speed is in control of dealing with the length of the exposure so the longer the shutter speed, the more light will come in, and in contrast the shorter the shutter speed, the less light will come into the image. It is also key to determining the amount of blur that appears in the photo so the longer the exposure the more susceptible the image is to blur and camera shaking.
The ISO is the sensitivity of the sensor to light so a lower ISO will mean that the sensor is less sensitive and is therefore going to need more light to expose an image. Higher ISO requires less light to expose the image but will add more noise to it which unfortunately results in color saturation which makes them look unrealistic.
This really is a valuable video to learn from so get your camera out and get learning