"Used to" expresses the idea that something was an old habit that stopped in the past. It indicates
that something was often repeated in the past, but it is not usually done now.
Jerry used to study English.
I used to eat meat, but now I am a vegetarian.
We didn't use to start work at 9 o'clock, but now we do.
Did the teacher use to watch a movie during class?
get used to
Get used to shows that something is in the process of becoming normal
Many people have got used to eating little amounts of food.
Will you get used to studying English?
be used to
Be used to is used to say that something is normal, not unusual.