~だけでなく・~ばかりでなく
Not only this, but also something more
You’ll be able to expand a statement beyond one item by adding another important fact or example.

この農園では果物だけでなく、アイスも食べられます。
kono nouen de wa kudamono dake de naku, aisu mo taberaremasu.
What do you think this sentence means?
At this farm, you can eat not only fruit, but ice cream too.
Not only that, but also
~だけでなく and ~ばかりでなく mean “not only ... but also....” They first name one item, then add another item that is also included.
妹はピアノだけでなく、ギターも弾けます。
imouto wa piano dake de naku, gitaa mo hikemasu.
My younger sister can play not only the piano but also the guitar.
この本は子どもばかりでなく、大人にも人気です。
kono hon wa kodomo bakari de naku, otona ni mo ninki desu.
This book is popular not only with children but also with adults.
Add も to the second item
Use noun + だけでなく/ばかりでなく, or a plain predicate + だけでなく/ばかりでなく. The second part commonly takes も. ~ばかりでなく is slightly more formal.
この店は料理がおいしいだけでなく、店員も親切です。
kono mise wa ryouri ga oishii dake de naku, ten'in mo shinsetsu desu.
This restaurant not only has delicious food, but also kind staff.
この薬は、頭痛だけでなく、歯の痛みにも効きます。
kono kusuri wa, zutsuu dake de naku, ha no itami ni mo kikimasu.
This medicine works not only for headaches but also for toothaches.
彼女は歌が上手なだけでなく、ダンスも得意だ。
kanojo wa uta ga jouzu na dake de naku, dansu mo tokui da.
She is not only a good singer but also a good dancer.
この町は、温泉だけでなく、スキー場も有名です。
kono machi wa, onsen dake de naku, sukiijou mo yuumei desu.
This town is famous not only for its hot springs but also for its ski slopes.
7 more examples in the grammar path — free for a limited time.