• 左手ひだりて — left hand
• 左側ひだりがわ — left side
• 左利ひだりきき — left-handed
• 左折させつ — left turn (e.g. in driving/navigation)
• 左派さは — left wing (politics)

“左” is a foundational directional kanji. It pairs with its opposite — 右 (right) — and appears in navigation, everyday speech, and descriptions of movement. It's one of the first directional kanji students encounter.

左ひだりに 曲まがって ください。
Please turn left.

彼かれは 左利ひだりきき です。
He is left-handed.