It's all about microbiology - the tiny microorganisms like yeast and mold that can make your bread go from delicious to disgusting in a matter of days. Mold is the main culprit behind bread spoilage, and it thrives in warm, humid environments. To keep your bread fresh, you need to create an environment that's less conducive to mold growth.
One quirky fact about homemade bread is that it can be too fresh! That's right - if you store your bread in an airtight container immediately after baking, it can become soggy and dense due to the excess moisture. Aging your bread for a few hours can actually improve its texture and flavor.