Socrates believed that real wisdom lies in knowing that we know nothing. There is certainly a plethora of information on the internet. Below are some of my favorite sources of research and personal experience, expressed in ways that I have found helpful.
Techniques for improving focus
These are some educational and helpful links about mood disorders and anxiety disorders.
A video about depression and anxiety from the perspective of someone who has experienced them both, studied them, and traveled the world talking about them. Expressed eloquently, so that those who have not had these problems might understand the trials of their loved ones, and so that those who have had these problems know that they are not alone.