What should I put under my sandbox?

As a keen observer of the cryptocurrency and finance landscape, I'm often faced with the question: "What should I put under my sandbox?" This, of course, is a metaphorical reference to the "sandbox" concept in technology, where developers test new features or applications in a controlled environment before releasing them to the wider world. In the context of cryptocurrency and finance, this sandbox could represent a testing ground for new investment strategies, trading algorithms, or even the exploration of emerging blockchain technologies. The question begs: What fundamental principles or strategies should one consider as the foundation or "underlay" for this sandbox? Might it be a robust risk management framework? Or perhaps a diversified portfolio approach? Could it be the deep understanding of market cycles and trend analysis? Whatever the answer, it's clear that the key lies in laying a solid foundation to ensure the sandbox environment is both safe and effective for experimentation and learning.