The conversation between Jeff Miles and Lynn Bridges focuses on the stock market and its impact on retirement portfolios. They discuss the recent volatility in the market, the dominance of a few stocks in driving market performance, and the importance of diversification and asset allocation. Lynn emphasizes the need for a non-emotional, mathematical approach to investing and the value of ETFs in achieving diversification. They also touch on the importance of finding a trustworthy financial advisor and the role of education in reducing stress and uncertainty in retirement planning.