To ferry or carry someone/something across (e.g., a river); to transport across.
船で乗客を島まで渡した。
He ferried the passengers to the island by boat.
濁流で車を対岸に渡すのは危険だ。
It's dangerous to try to carry a car across to the opposite bank in the raging current.
そのフェリーは毎日村民を川の向こうへ渡す。
The ferry carries villagers across the river every day.
To lay across or build across (e.g., placing a plank across a gap); to span something.
大工は二つの石の上に板を渡して仮の橋を作った。
The carpenter laid a plank across two stones to make a temporary bridge.
庭の小川に足場を渡して作業をした。
They laid a platform over the stream in the garden to work.
電線を柱から柱へ渡して配線した。
They strung the electrical wires from pole to pole.
To hand over, hand in, pass, give, or transfer something to someone (e.g., documents, objects).
先生に宿題を渡した。
I handed my homework to the teacher.
会議で資料を参加者全員に渡した。
I distributed the materials to all participants at the meeting.
彼は鍵を後任に渡した。
He handed the keys over to his successor.