Japanese by Example
Learning through examples in manga

Precisely because of the fundamentals with 〜からこそ

くノ一ツバキの胸の内 » Volume 5 » Page 120

During a training session, Tsubaki quickly subdues Asagao. Sazanka uses this opportunity to launch a surprise attack, only for Tsubaki to anticipate it and take her down as well.

ツバキ:
不意(ふい)をつくばかりじゃダメです。」
“You can't just rely on surprise attacks.”
基本(きほん)があるからこそ奇襲(きしゅう)()きるんです。」
“It's precisely from having fundamentals that surprise attacks become effective.”
サザンカ:
「はい…」
“Yeah...”

Tsubaki is teaching that being clever or tricky (using surprise attacks) isn’t enough on its own. True skill comes from mastering the basics first, which then make those surprise moves actually work.