This grammar point is used for emphasizing that not only one thing but also another thing is included. It means 'not only... but also' or 'of course... and...'.
The ～はもちろん～も grammar point is used to emphasize that not only the first thing mentioned is included, but also the second thing. It can be translated as 'not only... but also' or 'of course... and...' in English. This grammar phrase can be used with nouns.