You may be surprised what you can find here!
That depends on what you are looking for.
OneSearch is a Google-like search of nearly all of Wesleyan's online and in-library (physical) resources, as well as materials available from Connecticut College and Trinity College, though it does not include WorldCat which must be searched separately. See the OneSearch Help Guide for tips on how best to use its features.
WorldCat is a list of most books in most libraries in the United States and many libraries elsewhere, so if a book has been published and cataloged by libraries it is most likely listed in WorldCat. This includes many titles not in Wesleyan’s collection and thus not included in OneSearch. WorldCat does indicate whether a particular title is held by Wesleyan, Trinity, or Conn College.
So, if you are looking for a specific book (or audio/video recording or other specific known item), use OneSearch and limit your search to "Wesleyan Books & Media" to see if it is available at Wesleyan, or limit to "CTW Books & Media" to also check Connecticut College and Trinity College; if a book is at Conn or Trinity, you can place a CTW request to have it sent to Wesleyan. For books not listed in OneSearch, you can use WorldCat, which allows you to place an interlibrary loan request for books not in a CTW library.
If you are looking for a specific article, use the Journal Titles A-Z list to see whether Wesleyan has online access or a physical copy of the journal (or magazine or newspaper) the article is in, then find the article in the journal. If the library does not subscribe to the journal, you can place an interlibrary loan request for the article. Or, you can enter the article title into OneSearch to see if OneSearch has a record for the article -- to make sure the record for the article shows up at or near the top of the results list, put quotes around the title to search it as a phrase, and add the author's name and/or the title of the journal.
If you are looking for information on a topic, OneSearch is a good place to start. Enter a few keywords to describe your topic, then you can narrow and specify the results using the facets on the left of the screen (limiting to peer reviewed sources, sources in a particular discipline, etc). Or, you can look through the Indexes & Databases to find an appropriate subject specific index of publications.
Or, you can ask a librarian for assistance.