Night
Evening
noun
The kanji and the word are exactly the same. That means they share meanings as well.
よる
Since this word is made up of a single kanji, it should use the kun'yomi reading. When learning the kanji, you didn't learn that reading, so here's a mnemonic to help you with this word:
It is the night, but it is your (よる) night.
きのうの夜、パーティーに行きました。
I went to a party last night.
きのうの夜は、こうふんしてほとんどねむれませんでした。
Last night, I was so excited that I barely slept.
夜には、モンスターたちが床から這い上がり、私のベッドの下でお茶会を開くんだよ。
Night is the time when monsters crawl up through the floor to have tea parties under my bed.