In short and simple terms, "good publicity" means positive or favorable attention and opinions that help promote or enhance someone or something's reputation or image.
Sentences with «good publicity»
Good to see them getting such good publicity for these great, goofy dogs. (itchmo.com)
It's all good publicity for the store as well as the author — running an event is better than not running one. (bookbuzzr.com)
If they enjoy your work (again, if you've written a good book) then they generate good publicity. (authorlink.com)