“Is psychotherapy good for anger management?”

Yes, most emotional and behavioral health issues require some component of psychotherapy, and when indicated, medications. The key with any mental health condition is a comprehensive evaluation of medical, psychological, and social factors that may be contributing to the picture. Without a clear, thorough understanding of the contributing factors, it would be hard to properly target the treatment. For example, one would not want to miss thyroid disease presenting as depression or heavy cannabis use as the precipitant for a psychosis.

See this link...
https://www.apa.org/topics/anger/understanding
or
https://www.mindshiftwellnesscenter.com/what-is-the-best-therapy-for-anger-management/