What is basic truth that all other theories are based on?

The basic truth that underpins all theories is the principle of consistency and coherence within a specific framework of understanding. This involves the assumption that reality can be observed, studied, and understood through evidence and reason. Additionally, theories often rely on fundamental concepts such as causality and the existence of an objective reality that can be measured and analyzed. Ultimately, the pursuit of knowledge is grounded in the search for reliable patterns and explanations that align with empirical observations.