Ofcourse you need to do some research in order to understand the major psychological theories.
But if you only want to know the names of the main theories, so here they are :
Freud created the psychology based on his compulsion theory. His succesors devided into the "ego psychology" theory and the "object- relations psychology". the next level was the "self psychology" that is the norm today but changung all the time. All those theories belongs to psychotherapy.
Besides you can find the behavioral- psychology, the cognitive- psychology, the social- psychology and many other areas in the large field of psychology.
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