When writing nonfiction, the way I fact-check and research depends on whether the piece is personal or academic. For personal works, I make an effort to clearly recall the anecdotes I will be using and weave them together with outside facts. This allows me to present my perspective without appearing too biased.
On the other hand, when working on academic papers, I approach them by considering counterarguments which help me identify any gaps in my claim and explore possible alternative views. This method is easier to implement when I am aware of who the stakeholders are in the situation. Lastly, I also try my best to go over a variety of sources and media to enhance the credibility of my paper.