Recently, in a Webmaster Central Hangout, John Mueller from Google discussed content optimization for voice search and Google Assistant, and answered queries related to the same. He classified good and bad content, and suggested what’s not a good fit. He advises to avoid over-optimizing and provided examples of what might be perceived as a spam.
Some time back, Google launched Google Assistant for speakers and cars. They sent notice to publishers suggesting them ways to upgrade their content to be more visible on Google Assistant. Currently, the feature is applicable only to a handful kinds of content, which would surely expand to other types of content. Thus, understanding content optimization for Google Assistant would be an important aspect of search marketing in 2018.