This is a great question. I think knowing something for me is related to being able see the next move. I am also a chess player and a rock climber. I know how to climb and how to play chess. I know I know these things because I have the experience to analyze a position and make decisions in the present based of my understanding of the most probable futures. This knowing is from experience and relates to my career. I am a software developer and I know I know how to do this (a little bit, also have heavy imposter syndrome at times lol) because I can visualize multiple steps of a process.

Not just at high level either. Like I know detailed step-by-step, line-by-line, character-by-character even, instructions for how to accomplish certain tasks and, possibly more importantly, instructions for how to resolve certain issues.

In a state of uncertainty, I cannot foresee the next moment in a sequence of events. That, for me, is a difference between knowing and not knowing.