If you are learning the Yang Style Taijiquan long form, you might find the following webpage useful to you as you study and practice:
Yang Family Style Tai Chi Chuan Traditional Long Form
By Michael P. Garofalo.
webpage provides a list and brief description of the 108 movements of
the Yang Style Taijiquan Long Form divided into five sections for
teaching (.html and .pdf versions available). The webpage includes an
extensive bibliography on the subject, scores of Internet links,
historical notes, and quotations. 120Kb.
The Yang Long Form
discussed on this webpage conforms to the form developed by Yang
Cheng-Fu (1883-1936) and documented in books by Bu Fu
Zongwen (1903-1994) and Yang Zhenduo. The numbering of the movements
varies from author to author, but the essential sequence and moves
remains the same.