Monarch OneSearch, the Libraries' general search tool is an excellent starting point for doing background research in order to understand or develop your topic. It casts a wide net, searching a variety of subjects and sources, and the "Reference Entries" limiter allows you to narrow down your search to sources like encyclopedias and dictionaries.
Coverage varies (Open Access)
The online library of the Organisation for Economic Cooperation and Development (OECD) features its books, papers and statistics and is the gateway to OECD’s analysis and data.