GRAMMAR DETAIL

〜はもちろん

not only · of course

Names something that is naturally included and emphasizes that another item is included as well.

Examples

この図書館では学生はもちろん地域の住民も利用できる。

This library can be used not only by students, of course, but also by local residents.

この講座は初心者はもちろん経験者にも役立つ。

This course is useful not only for beginners but also for experienced learners.

Structure: はもちろん follows a noun, treats it as an obvious inclusion, and extends the scope to another item.
Basic usage: この講座は初心者はもちろん経験者にも役立つ。 says that the course benefits beginners, of course, and experienced learners as well.

The following particle has a role
- 経験者にも役立つ retains に for the people who benefit and adds も. In 学生はもちろん住民も利用できる, the people are users, so the same にも cannot simply be carried over.