To Touch Something
intransitive verb, transitive verb, godan verb
Because the hiragana ends with an う sound, you know this word is a verb. The kanji itself means touch so the verb vocab version is to touch something.
触る is used when someone does the touching. It's not used to describe objects touching each other.
Note that 触る can be used with either the particle に or を, like 手に触る or 手を触る (to touch a hand). Using に simply marks the location you touch, while using を highlights your action of touching that specific area or object. So the former is intransitive and the latter is transitive, though there's some debate about that.
Since this word consists of a kanji with hiragana attached, you can bet that it will use the kun'yomi reading. You didn't learn that reading with this kanji, so here's a mnemonic to help you: You're an idiot. You try to touch a saw (さわ).
Hands off my computer!
When I touch this with my hand, it feels warm.
That man suddenly touched my shoulder.
I love to pet cats, but our cat doesn't like it when strangers touch her.
When I'm on the phone, I have a habit of touching my hair.