Meaning of ‘Get into’ Phrasal Verb in English

The cat squeezed to get into the cardboard box.

It's hard to get into the crowded elevator during rush hour.

He struggled to get into the small car because he's quite tall.

She managed to get into her favorite jeans after months of dieting.

The key wouldn't turn in the lock, so I couldn't get into the house.

I want to get into a comfortable position before we start the movie.

They got into a heated argument about politics.

She decided to get into gardening as a new hobby.

He got into trouble for breaking the school rules.

She wants to get into the music industry as a singer.

He's trying to get into shape by going to the gym regularly.

After reading that book, I got into science fiction literature.