Here are the tutorials on Adobe Photoshop:
A guide to help you learn how to change a background of any image. This can be done through a number of methods. The one that i have used here is Polygonal Lasso Tool . This tool is easy and very helpful specially for beginners.
Want to add that bokeh effect to your images ? Or something like the Portrait mode found in some truly expensive phones and how about a DSLR? This post will teach you how to add that Blur effect in Adobe Photoshop.