Natural
Obvious
な adjective, の adjective
Something that's naturally right is something that's very obvious and natural. You know that, right? 当然!
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.
当然考える
a natural consideration, would naturally think about something
当然ある
something is naturally there, of course there is something
当然知っている
common sense, of course one knows something
「すごい!あのテストで百点とったの?」「当然さ。」
"Wow! You scored a one hundred on that test?" "Naturally."
かん字が上手くなりたければ毎日少しずつ練習するのは当然でしょう!
It's only natural that you must practice kanji little by little every day in order to become good at it.
あんな素敵な奥さんがいるなんて、お前は本当に運がいいよな。当然のことだなんて思うなよ。
You are very lucky to have such a lovely wife. Don’t take her for granted.