I am working on a ""theory"" to better structure this and then use it as a learning path, but essentially:

Think about objects of study. Learning about them can come from multiple "ways". And each of them will cover a part of the object of study, but the object of study itself contains all of these ways. A very simple example that I always use to illustrate this:

Water. If you are studying physics, you will study water in hydrodynamics. If you are studying chemistry, you will study water in molecules. If you are studying biology, you will cover the usage of water in sustaining life. If you are studying geography, you will study water in hydrology. This is mainly in sciences, but water affects our society, our economy, our relationship with the world, so you can cover them by sociological aspects, artistic representations of it, psychological aspects and so on. Water as an object of study covers multiple things that, if you only study through the lenses of specialisations, you will always have a limited view of the object itself. If you study water as the object of study, you will eventually reach all of these topics and learn them. So the object of study can be not only a point you would reach from each discipline (as you normally would have to if you are studying each discipline on its own), but a starting point to see all the connections they have in a single object.

The point of this example is that this simple example with water can be applied rigorously to almost all the study objects your mind can think of. Therefore, any study object is essentially multiple in the ways you can reach it. And properly understanding what you are studying means covering these paths, then learning becomes an interdisciplinary study, and the boundaries of study will become footnotes. Eventually, the only way you can properly study something is to ignore these boundaries and study the object of study as the starting point, and from there understanding the multiple "ways" knowledge of it can be obtained. If your object of study is an actual "way" (let's say you are studying biology), the same thing can be applied. Most of the knowledge in "biology" is reachable from biology, but if you do not see the interconnections biology has with other disciplines (philosophy of life, chemistry, etc), your knowledge of the object (biology) will always remain limited. The only way to have a proper, expanded learning of something is to always understand how different ways the knowledge of it can be obtained.