HubPages suggests appropriate tags. Look in the right hand column on each of your Hubs. Choose the appropriate ones. You can also make your own, and they should also relate to the subject of your Hub. So, if your Hub is about a brownie baking recipe, entering your own tags such as "hot monkey sex" would be inappropriate.
Ditto with category and title.
With the title, don't be "cutesy", but write one that is appropriate and descriptive of the content.
If you THINK about it, it is really not that difficult.