The two key takeaways that I got from Rich Dad Poor Dad were these:
"Wealth is the number of days you can live off of your assets" -- which is to say that if you have $1,000,000 and can live off of 40k per year at 4% interest, you can live indefinitely off of your assets. The same amount of money is less than 15 years worth of wealth if you spend 100k+ per year.
"Assets cash flow, liabilities remove cash flow" -- although not a strict accounting definition this is useful when considering vacation properties (remove cash flow) and buying a larger principle residence (remove cash flow) -- he calls these things "doodads". Instead we should accumulate cash generating assets.
To become wealthy, we should accumulate assets that generate cash, until our asset base is so large that it covers our spend rate in perpetuity.
Perfect summary of two of the best points in the book! :)