“Photo Editing Tutorial: Basic Adobe Photoshop Workflow” by Science Filmmaking Tips
This video teaches new techniques on how to edit photos using a graduated filter. I had never used this before and found it particularly interesting in that it allows you to edit a section of the picture but because the filter is graduated it is subtle enough that it looks natural while also greatly enhancing the section you want to edit.
It also goes over how to add a lens flare. In order to do this you must work on a separate layer and change the opacity to make it look the most natural.