Heart, Mind, Feeling
noun
The kanji and the word are exactly the same. That means they share meanings as well.
こころ
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: Imagine a giant heart sitting in a rowing boat. It's also drinking cocoa. Focus on all three of these parts and associate them into one story / memory. Once you've done that, sing the "cocoa row" (こころ) song! I don't know what that song is, but I want you to make one up and actually sing it, out loud. If you do, I bet you won't forget this word's reading too easily.
パパは心が大きい。
Dad has a big heart.
キューピッドの矢が心にささった。
Cupid's arrow struck my heart.
「おはよう、王子」と、心の中でいった。
"Good morning, prince," I said in my mind.