If you're not sure where to start, you might want to search the Libraries' catalog for books on investing, or stocks. If you're looking for information about a particular equity, the three best databases to start with are Morningstar, NetAdvantage and Mergent Online. Morningstar contains a section on sustainability and an ESG risk assessment for each company, as well as analyst commentary. NetAdvantage has very detailed financials and a great chart builder tool, as well as industry surveys that include a section called "How to Analyze a Company In This Industry". And Mergent Online provides access to the Investext analyst reports.
Please contact the Business Librarian if you would like further assistance with your research.