He stuck to his first thought or decision.

He is learning the basics of Japanese.

Colostrum is very important for the health of newborns.

He successfully completed his first year at university.

The first frost of the year came early, didn't it?

At our first meeting, he behaved very kindly.

This is my first experience, and I'm very excited.

He made his debut on stage yesterday.

I don't know what to do on a first date.

I can't forget my first kiss with him.