If you are a layman with no goals beyond aimless experimentation, you shouldn't be buying a DGX or any other form of dedicated AI hardware. It won't be useful for anything else and you don't personally need it.
The reason you don't need it is that you don't need to be on the cutting edge to learn. Back when I was an electrical engineering undergrad student, one of the most important project courses I did was based on dinky little 8-bit microcontrollers, at a time when cheap home computers were probably at least a thousand times faster. Another important one was a lab partner and I implementing a CPU - but once again that CPU was nowhere close to high performance. Speed wasn't necessary to learn the principles of how things worked. If you're operating at the equivalent of undergrad level, or less, which is what it sounds like, there's no need to invest in expensive tools yet. You can dip your toes in the water using hardware that's much more accessible - hardware that you probably already have - on much smaller models.
Finally, LLMs and all other forms of "generative AI" are a hype bubble that is going to pop, not the foundational technology of the next 25 years. If you're curious about them, cool, but don't fall for the FOMO being spread by those inflating the bubble.
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