Mental wellness is a big topic and has many different facets. One way mental health can be described is as “a state of well-being in which the individual realizes his or her own abilities, can cope with the normal stresses of life, can work productively and fruitfully, and is able to make a contribution to his or her community” (World Health Organization).
Some examples of subjects to search for relating to mental wellness could be: Meditation -- Psychological aspects., Self-help publications., Anxiety disorders -- Treatment -- Popular works., Depression in adolescence -- Treatment.