I hope you will be able to see their differences from their meanings:

*Into*: 

>–preposition  
1.  
to the inside of; in  toward: He walked into the room. The train chugged into the station.  
2.  
toward or in  the direction of: going into town.  
3.  
to  a point of contact with; against: backed into a parked car.


*In*:

>–preposition  
1.  
(used to indicate inclusion within space, a place, or limits): walking in the park.  
2.  
(used to indicate inclusion within something abstract or immaterial): in politics; in the autumn.  
3.  
(used to indicate inclusion within or occurrence during a period or limit of time): in ancient times; a task done in ten minutes.  

*In* is used to indicate inclusion within; *into* is used when there is movement.