Concern
Interest
noun
The things related to your heart are the things that concern and interest you the most.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
関心がある
to be interested
関心がない
to have no interest
関心が高まる
to become more interested
関心を持つ
to have an interest
関心を高める
to enhance interest
関心を集める
to attract interest
ご関心
interest (humble)
国民の関心
the interest of the public
自分の関心
one's own interest
人々の関心
people's interest
アイツは他人に関心がないんだよ。
He's not interested in others, you know.
うちの場合は、父親の子育てへの関心がゼロだったんですよね。
In our case, my father had absolutely zero concern in parenting.
皆さん、もっと政治に関心を持ってください。
Everyone, please take more interest in politics.