This webinar introduces Guide to Reference, an online resource that provides evaluations of over 17,000 reference sources. It aims to show how Guide to Reference can support reference, collection development, and teaching. The webinar discusses the history and strengths of Guide to Reference, including its selective and broad coverage across many subjects. It highlights how the online version allows for powerful searching, saving work, and sharing annotations. The webinar also addresses current challenges in reference, collection development, and teaching, and how Guide to Reference can help address them. It demonstrates key features like the taxonomy, Editor's Guides, and saving searches before concluding with next steps and Q&A.