I recommend exploring the following guides which provide valuable technical tips related to the effective use of the library and its resources.
Here you can learn about Yale collections and resources for archival and manuscript collections. Finding aids are inventories, indexes, or guides that are created by archival and manuscript repositories to provide information about specific collections.
Orbis (Yale Library catalog)
Yale Library Borrowing & Privileges
Yale Purchase Request (if you want us to buy a particular item for the library)
Beinecke Library (the rare book and manuscript library at Yale)