Question

what is the difference between break in and brek into?

Answer 1

"Break in" is used by itself, with no mention of what the thief entered.

"Break into" is used when it is mentioned.
Observe:

"Hey, Joe, did you hear that my house got broken into last night?"
"No, how did the guy break in?"
"Well, first he broke into the basement with a crowbar...."

Answer 2

firstly you have a spelling mistake that is break into
secondly

break in could be for a verbal use and break into would be used for the solely uses