Use site: after keywords in Google to limit search results to a .gov .org .edu or other domain type. Use site: followed by a whole domain (like fda.gov or wright.edu) to use Google to search all pages of a website (especially helpful if the website does not have its own search feature.) For instance:
will return any government websites that feature the word obesity.
will return any pages on the fda.gov website that use the word obesity.
Use the Tools button to limit results to the most recent day, week, year, etc.
When performing an Image search, click Settings, Advanced search, then use the usage rights drop-down list to select Free to Use and Share (especially important if you're using the images in a presentation or paper that may be published and for copyright purposes).
Many of the tips and tricks discussed in library instruction sessions or one-on-one librarian appointments work in Google as well. These include putting key phrases in quotes, boolean operators, and others.
Often, you'll discover the right level of focus as you begin your research. Encyclopedias and dictionaries can be a great place to start this research. Use these resources to get topic ideas or for background information.
Learning how to read scholarly articles and incorporate them into your work will improve the quality of your research and writing, and has the potential to save you time and reduce stress.