Yap.Town

が大事です

is important

→ が
phrase Rare #39,434
is important 大事 means “important” or “precious.” が marks what is important; です makes the statement polite.
JA: 健康が大事です。
EN: Health is important.

これが大事です。

This is important.

— ムーンライズ・キングダム (2012)

話し方よりも話す内容の方が大事です。

What you say is more important than how you say it.