According to PANews, Robert Kiyosaki, author of 'Rich Dad Poor Dad,' has advised ordinary investors to consider gold, silver, and Bitcoin ETFs due to their convenience in investment. However, he cautions that ETFs are merely 'paper versions' of assets, akin to using a picture of a gun for self-defense, whereas physical assets offer greater security. Kiyosaki suggests holding physical gold, silver, and Bitcoin when appropriate, while understanding when to opt for physical assets versus ETFs to ensure a more stable investment strategy.