Kris Krohn discusses the importance of maximizing discretionary income for building wealth, particularly for those starting with limited resources. He emphasizes the need to reduce expenses, negotiate bills, and create a strict budget to save at least 20% of income. Krohn also advocates for increasing income through raises, side gigs, or investments in real estate to generate additional discretionary funds. Lastly, he encourages investing wisely, particularly in real estate, and offers guidance on creating a personalized plan for financial success.