The first skill mentioned is search engine optimization and a core understanding of keywords and tags. Knowing who your art will appeal too and search terms they will use will help. Front page results are important and only a small proportion of people will continue to second or deeper search.
It is the social media and video sites that will use the tags to help the work be found, including facebook, twitter, Instagram and youtube, of course there are many other metrics to consider also for extra visibility.
An example given is the term “pencil drawings”, here Robert explains what happens in that scenario. Posting on socials regularly is also a key and deciding what to post, so the visitors are fully engaged with the work.