There's "no other job where you get paid to tell the truth...we are detectives for the people." The late, great investigative reporter Wayne Barrett, in his last column for the Village Voice.
Fact checking will bulletproof your reporting
Always ask yourself these questions when trying to verify information:
What Do I Check?
Source: Smith, Sarah H. The Fact Checker’s Bible: A Guide to Getting it Right. University of Chicago Press: 2016.
Frequent Sources of Error
Source: Carroll, Brian. Writing and Editing for Digital Media. Routledge: 2014.
Where do I fact check?
"subconscious tendency to seek and interpret information and other evidence in ways that affirm our existing beliefs, ideas, expectations, and/or hypotheses. Therefore, confirmation bias is both affected by and feeds our implicit biases. It can be most entrenched around beliefs and ideas that we are strongly attached to or that provoke a strong emotional response." Source: Facing History and Ourselves
How to Thwart Your Confirmation Bias
Make an Accuracy Checklist a part of your reporting process
Here is a list of other good ones to use:
Fact-checking guides relating to politics: