know-all, know-everything, smartass, Besserwisser, smart aleck, blowhard, wiseacre, jackass, wise guy, armchair quarterback, more...

humble, modest, open-minded, teachable

a know it all,   opinionated person,   annoyingly smart,   no it all,   smartypants org,   educated idiot,   who know how,   knows it all,   known it all,   ipinionated type