~はもちろん
Not only this obvious case, but also...
You’ll be able to name an obvious included example and extend the statement to another one.

この鉄道博物館は、子供はもちろん、大人も楽しめます。
kono tetsudou hakubutsukan wa, kodomo wa mochiron, otona mo tanoshimemasu.
What do you think this sentence means?
This railway museum is fun for adults too, not just for children.
Not just that, of course
~はもちろん means “of course...” or “not only....” It first names an expected example, then adds another example that is also included.
週末はもちろん、平日も混んでいます。
shuumatsu wa mochiron, heijitsu mo konde imasu.
It is crowded on weekdays too, not to mention weekends.
ひらがなはもちろん、漢字も読めます。
hiragana wa mochiron, kanji mo yomemasu.
I can read kanji too, not to mention hiragana.
Add another included example
Attach はもちろん to a noun. The following item normally takes も and broadens the statement beyond the first, obvious case.
日本語はもちろん、英語でも説明できます。
nihongo wa mochiron, eigo de mo setsumei dekimasu.
I can explain it in Japanese, of course, and in English too.
この旅館は、料理はもちろん、温泉もすばらしい。
kono ryokan wa, ryouri wa mochiron, onsen mo subarashii.
At this inn, the food is of course excellent, and the hot spring is wonderful too.
引っ越しの日は、家族はもちろん、友達も三人手伝いに来てくれた。
hikkoshi no hi wa, kazoku wa mochiron, tomodachi mo sannin tetsudai ni kite kureta.
On moving day, my family came to help, of course, and three friends did too.
運動はもちろん、毎日の食事にも気をつけています。
undou wa mochiron, mainichi no shokuji ni mo ki o tsukete imasu.
I exercise, of course, and I’m also careful about my daily diet.
7 more examples in the grammar path — free for a limited time.