Psychoanalysis: dream interpretation, early experience release, hypnosis, etc.
Behaviorism: reinforcement, system desensitization, behavior reengineering, etc.
Cognition: ABC therapy, Bell cognitive therapy, etc.
Humanism: people-oriented, active concern, family therapy, etc.
What I have listed is only a theoretical framework. If you want to solve your own problems, you can search books according to my framework. But I don't guarantee that you will have the patience to finish reading this book.
If you are a psychology major, how to choose these methods will suit the right medicine. Collect enough information about visitors during the first consultation. Summarize the causes of the problem and analyze the personality of the visitors to choose the appropriate method. Of course, you must obtain the consent of the visitors, otherwise it is illegal to use the professional code.