The concept of dimensions can be quite abstract, and when people talk about going into the fourth dimension, they often refer to it in a metaphorical or speculative sense. In physics, the fourth dimension is often associated with time, forming a four-dimensional space-time continuum.
If you are referring to time as the fourth dimension, we are all inherently experiencing it as we move forward in time. However, if you're referring to exploring higher spatial dimensions beyond our familiar three dimensions (length, width, and height), that would require a significant shift in our understanding of the universe.
According to current scientific understanding, we cannot directly access or experience higher spatial dimensions beyond the three dimensions we are accustomed to. Our physical reality seems to be confined to these dimensions. Theoretical physics, such as superstring theory and M-theory, postulates the existence of additional spatial dimensions, but they are believed to be "curled up" or compactified at microscopic scales, making them inaccessible to our everyday perception.
It's important to note that any discussion about higher dimensions goes beyond our current scientific knowledge and enters the realm of speculation and theoretical physics. While there are various mathematical models and hypotheses, actually accessing or experiencing higher dimensions remains purely speculative at this point.
If you're interested in learning more about dimensions and the current scientific understanding, studying theoretical physics and mathematics would be a good starting point. However, keep in mind that the exploration of higher dimensions is an ongoing area of research and remains highly theoretical.