Cognitive bias is a systematic thought process caused by the tendency of the human brain to simplify information processing through a filter of personal experience and preferences. The filtering process is a coping mechanism that enables the brain to prioritize and process large amounts of information quickly.
This is natural for all humans who do not pursue unlocking their human potential by new learning and feedback from others. It is simply much easier to see discomfort as wrong and take the comfortable low road.
Those facing significant cognitive biases are trapped in their own "rabbit hole" of subjective reality. Cognitive biases are flaws in your thinking that can lead you to draw inaccurate conclusions. They can be harmful because they cause you to focus too much on some kinds of information while overlooking other kinds. (Example: Confirmation Bias or the Bandwagon Effect)
Coaching and training subjects you to both conceptual and wider thinking on matters of decision making, leadership, behavior, memory, and judgement. One of the most comprehensive ways to avoid cognitive biases is having a high emotional intelligence. Emotional intelligence is the ability to identify and regulate one's emotions and understand the emotions the others. A high EQ helps you to build relationships, reduce team stress, defuse conflict and improve job satisfaction.
In an age of constant notifications, coworkers who are in distress, disastifying quality of life issues, and political polarization.... do yourself a favor and level up your EQ and prioritize the elimination of your cognitive biases. You will gain capacity and feel lighter to address every day matters.
Here is a relativity quick video from The Paint Explainer on several biases and here is a great directory from The Decision Lab.