In this chapter, we delineate the fundamental components of our textbook, which have been tested using examples from diverse fields. (This chapter is very important in its entirety, which is why we have given up on additional marking in grey). Specifically, we explore topics ranging from the transport and diffusion of charge carriers in amorphous materials to markets, such as financial and free markets with competing firms. Of course, all this is in the context of singular stochastics.