It can take a while to figure out the major authors and theories in an academic discipline. Certain kinds of books (handbooks, companions, readers, encyclopedias) can be helpful for finding your way.
Here are 3 examples of these kinds of sources.
Feminist Theory Reader by Carole Mccann; Seung-Kyung Kim
The third edition of the "Feminist Theory Reader" anthologizes the important classical and contemporary works of feminist theory within a multiracial transnational framework.
Debates in Transgender, Queer, and Feminist Theory: Contested Sites by Patricia Elliot
This book traces the emergence and development of Queer Studies as a field of scholarship, presenting key critical essays alongside more recent criticism that explores new directions.