to learn, to acquire knowledge / to wear (clothes, accessories, etc.), to put on

気を付ける: to be careful, to watch out; to take care

to light a fire / to set on fire; to ignite; to set fire to / (figuratively) to spark; to ignite (excitement, debate, controversy, etc.)

(dance) choreographer

Misspelling of きをつけて. Since o is written as を when used as a particle.

to find fault

everyone, one and all

(Internet slang) literally who would want this

Watch yourself, be careful, literally, "keep your health" / take care (used when parting)

police dog