Uncertainty of matters in thoughts and certainty of breath

I wonder if Buddhism has a concept or teaching surrounding what is happening in my personal practice right now. In my practice right now I want to reduce my focus on things that are certain. It's certain that I am typing on my phone right now, and breathing in. Then a idea pops up of something relating to the future, and I recognize the uncertainty around any theories surrounding the future. Earlier I came up with theories about craving and other things, and recognized the uncertainty of any such theories. I had many theories about how the mind works in the past but now I see the uncertainty in these theories. I try to synthesize insights based on what I learned from Buddhism but I'm uncertain of the theories in the end. Those mind theories I have are impermanent too, always changing and coming up with a new theory. But now the only certainty is my thumbs hitting my phone. Then a craving pops up and I'm led away from the certainty of breathing. Is there anything surrounding certainty or uncertainty in Buddhism being taught?