Finding content is more than just search: metadata, tags and keywords are an important aspect of improving the findability of content. However, adding these tags to content, also called indexing, is not as easy as it might seem. This workshop introduces the basic principles of tagging and indexing. It will start with some theoretic principles, guidelines and things to take into account. But you will also learn by doing: the workshop also contains some hands-on exercises on assigning tags to content.