Camera Techniques and Tutorials
There are many camera techniques that can be used to achieve a certain appearance on a photo.
I have found some of these tutorials very useful as it covers many different settings such as Aperture, Shutter Priority Mode, Histograms, Automatic Exposure Bracketing (AEB) and more tips.
This website was very useful for information on taking photos outdoors where there is a lot of exposure to sunlight.
Here the sun is in front of the children.
This picture was taken at the same time, the only difference is that the sun is behind them
Composition & Camera Angles
I found this video tutorial very informative in terms of composition and camera angles.