A Random Walk Down Wall Street
Malkiel makes the case for efficient markets: the idea that a stock's price already reflects the information available about the company, so consistently picking winners or timing the market is far harder than it looks. If the price already accounts for what is known, then most of the effort spent trying to beat the market is wasted.
From there he argues for low-cost index investing. Rather than paying active managers who try to outperform, he shows that over long stretches a simple, broad, low-fee index fund tends to beat most actively managed strategies once costs are taken out.
Biggest takeaway
I thought about my NQ trade on April 8 while reading: I had tried to call a bounce during a sell-off. My takeaway is to ask what evidence supports my confidence before trading. Waiting for a different setup might have changed that decision, but the book does not establish that a confirmation rule would give me an edge.