Be into something: to be interested in something.
My daughter is into sports all of a sudden and really wants to take tennis lessons.
Enter into something: to move into something.
Once you enter into the parking garage, turn left.
Get into: to use, access, or interfere with something, usually without permission to do so.
"It seems the cats got into their treats while we were at work today." "I just found the empty bag completely torn in half."