go into

to start doing a particular type of work:
My son's planning to go into journalism.
She's decided to go into business as a freelance computer programmer.

to start an activity, or start to be in a particular state or condition:
The drug is still being tested and will not go into commercial production for at least two years.
How many companies have gone into liquidation/receivership during the current recession?
Repeated death threats have forced them to go into hiding.
Her baby was born three hours after she went into labour.
Some of the fans seemed to go into a trance when she appeared on stage.
I'm glad she's going into medicine. It's a very worthy calling.
First she goes into a deep trance and then the spirit voices start to speak through her.
He's always wanted to go into teaching.
He goes into a fit of rage over the smallest mistake.
She went into a coma and died without recovering consciousness.

to discuss, examine, describe, or explain something in a detailed or careful way:
This is the first book to go into her personal life as well as her work.
I'd rather not go into that now. Can we discuss it later?
I'm unable to go into detail(s) at this stage because I still have very little information about how the accident happened.

mainly UK
If time, money, or effort goes into a product or activity, it is used when producing or doing it:
A considerable amount of time and effort has gone into this exhibition.

If a vehicle goes into something such as a tree or a wall, it hits it:
Their car was travelling at 50 miles an hour when it went into the tree.
(Cambridge Advanced Learner's Dictionary & Thesaurus からの go into sth の定義 © Cambridge University Press)

ビジネス英語
to start doing a particular type of work:
My son's planning to go into journalism.
She's decided to go into business as a freelance computer programmer.

to discuss, examine, or explain something in a detailed or careful way:
The company has gone into detail about the prospects for each division.

if time, money,la or effort goes into a product or activity, it is used when producing or doing it:
A considerable amount of time and effort has gone into this marketing campaign.
(Cambridge ビジネス英語辞典 からの go into sth の定義 © Cambridge University Press)

- Cambridge Dictionary