Journals cover a range of sources, including newspapers; magazines and scholarly journals. News and research around your subject area are usually published first in journals.
A journal can be useful:
Databases enable you to find journal articles and reports which have been written around your topic. Sometimes they will provide just a summary of the article or a link to the full online article itself.
Combining your search terms with 'AND' will narrow the time your search takes to produce fewer, more specific resources.
Combining your search terms with OR will broaden out your search to include related words and concepts, producing more results.