News organizations and professional journalists operate within a code of ethics to try to ensure their reporting is as fair and reliable as possible. This entails fact checking, vetting sources, and doing their best to present the facts. However a journalist or publication can do all these things and still show a biased perspective in what stories they choose to cover and how they choose to cover them. In fact, many people will choose one news source over another due to that bias!
Rather than avoiding biased news media altogether or simply taking that bias at face value, ask some questions about what you are reading and who wrote it:
These questions can be answered by doing online searches beyond the article to learn more about the author, the news organization, and to corroborate the article's claims with articles from other news sources on the same topic.
Understanding Bias from the News Literacy Project identifies five types and five forms of bias found in news media. PDF version.