Cornerstones are powerful global buffs that you choose at various points during an expedition. They can significantly alter your strategy, offering bonuses to production, Resolve, trading, or resource gathering. You'll typically be presented with a choice of three, so select the one that best complements your current settlement's needs and long-term goals.
Perks are similar to Cornerstones but are often tied to specific events or discoveries. They provide smaller, more focused bonuses. Both Cornerstones and Perks are crucial for optimizing your settlement's performance. Learn to identify which ones will provide the most impact given your current situation and the biome's challenges.