There are many, many resources available on various forms of Tai Chi Chuan. The ones listed below are specific to Cheng Man-Ch’ing’s Yang-style 37 posture short form or they focus on general tips for practicing Tai Chi.
There Are No Secrets: Professor Cheng Man Ch’ing and His Tai Chi Chuan by Paperback, January 27, 1993)
The Tai Chi Space: How to Move in Tai Chi and Qi Gong by Paul Cavel (Paperback, November 1, 2017)
The Harvard Medical School Guide to Tai Chi by Peter M. Wayne, Phd, with Mark L. Fuerst (Paperback, April 9, 2013)
T’ai Chi: The “Supreme Ultimate” Exercise for Health, Sport, and Self-Defense by (Paperback, December 15, 2004)