You can give your chaches,logs,images and swaggies a "tag", which is like a keyword or category label. Tags help you find items which have something in common. You can assign as many tags as you wish to each object.
It is best to be consise when setting a tag for an object. For instance: If you wish to highlight the fact that a cache is at a waterfall with a lookout and great views you could tag it with: waterfall lookout views