Year, Age
noun
The kanji and the word are exactly the same. That means they share meanings as well. You can also use this word to talk about someone's age.
とし
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: This year you plan on tossing (とし) out all your old stuff as a New Year's resolution. You pronounce it "toshing" though, because it has more vigor that way.
いい年になりますように。
May it be a good year.
２０２１年はオリンピックの年でした。
2021 was the year of the Olympics.
あの年からずっと木を切ってないよ。
I haven't cut down a tree since that year.