おはよう。

Ohayō.

Morning.

Word for word

“It’s early.”

Politeness: Casual

Plain form. Fine with family, close friends and people younger than you. Rude to a stranger or a boss.

When you would say it

The first time you see someone that day: family, friends, classmates, colleagues of your own rank.

Worth knowing

Add ございます (the next entry) for anyone you would use です/ます with.