You can give your caches, 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 concise 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 view
Common words and phrases like 'if' 'and' 'for' etc. are not saved, as well as punctuation and special characters.
If you MUST combine 2 words, they can be appended with a "+" so wheelchair+accessible is valid. Be aware that if you do this, people will have to enter the same text into the search box, i.e people searching for wheelchair will not see anything tagged with wheelchair+accessible.