I’m resting at home.
You should rest up well when you can, and then work hard when you have to.
The only time that I rest each day is when I’m sitting on the toilet.
This word consists of kanji with hiragana attached. Because the hiragana ends with an う sound, you know this word is a verb. The kanji itself means rest, so what's the verb version of that? It's to rest.
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 need to rest, right? Answer the question! You should say yes (やす).