Sometimes it is useful to get an overview of a topic before beginning your research in order to find a starting point. These resources will help you look into the history and background of LGBTQ studies and issues.
Gale Virtual Reference Library is an online collection of dozens of encyclopedias, handbooks, and guides. Type in your search term, or the title of a publication. Here are a few potential LGBTQ sources to look into, in addition to searching the reference database for keywords:
Encyclopedia of Lesbian, Gay, Bisexual and Transgendered History in America
Encyclopedia of Sex and Gender: Men and Women in the World's Cultures
If you are trying to get a general overview of an issue (trans healthcare for example), track down a specific policy, law, or the background (legislative history) of a law, there are a few great options. These resources provide details, but also often share both sides of opposing arguments to current issues and policies: