〜が上手です / 下手です
JLPT N5 Desire, invitation, preferencesgood at / bad at
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Jouzu (skilled) and heta (unskilled) are na-adjectives, and the skill takes ga. Avoid calling yourself jouzu; for your own abilities, tokui is more natural. Both follow the same pattern as suki and kirai.
Examples
さんはがです。 Tanaka san wa ryouri ga jouzu desu.
Tanaka is good at cooking.
はがです。 Watashi wa uta ga heta desu.
I am bad at singing.