11 top stock-market pros shared their biggest investing lessons in a new book. Here are the best takeaways.

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• "Stock Market Maestros" offers detailed investing advice from top fund managers.
• Experts share details of their processes, such as rebalancing and knowing when to exit a position.
• Some shared thoughts on popular tools like stop-losses

There are some investing tips that you hear over and over, but are light on specifics.

Diversify your portfolio. Don't let emotion — whether it be fear or greed — guide your decisions.