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がとても上手い

is very good at

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phrase Uncommon #19,446
is very good at The が marks the activity or skill someone is good at.
JA: 妹はピアノがとても上手い。
EN: My younger sister is very good at playing the piano.

トムはフランス語がとても上手い。

Tom is very good at French.

トムはテニスがとても上手い。

Tom is very good at tennis.

彼はテニスがとても上手い。

He is very good at tennis.

うちの旦那、料理がとても上手いの。

My husband is a really good cook.

父は自動車の運転がとても上手い。

My father is a very good driver.