Robert Kiyosaki, author of 'Rich Dad Poor Dad', has advised potential Bitcoin investors to act cautiously as the cryptocurrency surpasses $120,000. Kiyosaki, who plans to buy another Bitcoin, emphasized the importance of waiting for clearer economic signals before significantly increasing holdings. He warned against greed, suggesting that new investors start with small amounts, even as little as one Satoshi, to gradually build their positions. Kiyosaki also noted that Warren Buffett is holding $350 billion in cash, potentially waiting for a market downturn to acquire high-quality assets at lower prices.