I learned about the equilibrium constant. Now, I've seen that the equilibrium constant of burning is extremely small $(K \ll 1)$. here, I have a question. you see, $K$ is still NOT 0, which means that the forward reactions happen at least a tiny bit. Then, shouldn't we see some parts of anything burning at least a little bit?
Even if the concentration of product is extremely low compared to the reactants, shouldn't we observe something? Am I missing something?

Comment: The fact that there will always be some small reaction happening doesn't mean that you will see it or be able to detect it. The equilibrium constant $K$ is the ratio of the reaction rates of the forward and reverse reactions under equilibrium conditions. In the case of reactions with $K \ll 1$, the reverse reaction is much faster
but I don't. Am I misinterpreting $K\gg 0$ or missing something?

No, you are not misinterpreting the concept of an equilibrium constant or missing something.

The fact that $K$ is very small for the combustion reaction does indeed mean that the forward reaction happens only to a very small extent in comparison to the reverse reaction, which is why most substances do not ignite spontaneously under normal conditions. However