This chart provides visual context of where various media sources fall on the spectrum of neutral/objective reporting. It's also indicated if these sites tend to do more original/fact-based reporting. Since you've probably come across many of the sites shown in the chart, refer back to this infographic as you determine the usefulness of various news sources.
Other useful fact-checking steps:
Currency - When was it published? For websites, when was the last revision? Does your topic require the most current information?
Relevancy - How well does it relate to your topic? Who is the intended audience? Does this satisfy your information need?
Authority - Who is the author? What are the author's credentials or affiliations? Are they qualified to write on this topic?
Accuracy - Where does this information come from? Is the information supported by evidence? Does the author cite their sources?
Purpose - Is the purpose to inform, sell, entertain or persuade the reader? Is the information fact, opinion, or propaganda? Can you identify any bias?