To start with, it's all about storage. You want to keep your baguette in a cool, dry place, away from direct sunlight and heat sources. Think pantry or cupboard, not counter or windowsill.
Now, I know what you're thinking: "But I don't have a fancy bread box or anything!" Fear not, friends, because you can easily improvise with a paper bag or a clean towel to keep your bread cozy and fresh.