You can fact-check and double-check all of the information you want. But if you don't check your own biases along the way as well, you're only giving yourself part of the picture. Make sure your own biases aren't a lens by which you're distorting the information you're favoring or disfavoring.
Link for larger version of this infographic: https://www.lifehack.org/318015/infographic-20-cognitive-biases-that-screw-your-decisions