The phenomenon of only one side of the Moon being visible from Earth is known as tidal locking, and it is a result of the Moon's synchronous rotation. Tidal locking occurs when an object's rotation period matches its orbital period around another body, causing one side of the object to always face the larger body.
In the case of the Moon, its rotation period and orbital period around Earth are nearly identical, taking approximately 27.3 days to complete both. As a result, the same side of the Moon always faces Earth, while the far side, also called the "dark side" (not because it is always dark, but because it is unseen from Earth), remains hidden from our direct view.
The idea that there is something secretive or intentionally hidden on the far side of the Moon is purely speculative and not supported by scientific evidence. In reality, the far side of the Moon has been extensively explored and photographed by various spacecraft missions, including the Soviet Union's Luna missions, NASA's Apollo missions, and more recently, China's Chang'e missions.
The main reason for exploring the far side of the Moon is to gather scientific data and expand our knowledge about the lunar surface, its geology, and its history. By studying the far side, scientists can gain insights into the Moon's formation and evolution, as well as investigate differences between the near side and the far side.
It's important to rely on scientific evidence and credible sources when discussing such topics to avoid falling into conspiracy theories or unfounded speculations. The exploration of the Moon continues to be an active area of research, and new missions and discoveries contribute to our understanding of Earth's natural satellite.