The same difference as the words in and on. To go "into" something, means to be inserted inside of something. When eating soup, your spoon is inserted INto the bowl. Onto, is when something is placed on top of something else. When you make a ham and cheese sandwich you place your sandwich onto a plate. This l has gone into the brackets: ( l ) This l has been placed onto the brackets: l ()

Here is a good website with many examples to help you decide when to use into/onto. http://grammartips.homestead.com/into.html Hope this helps

The word "unto" has its roots in older English. It is seldom used today except when quoting old texts or in some idiom. It means "to" or "unit". Fight unto death. Unto us a son is born.

It's like in and on, but not a state but a direction. check this out: http://aprendamosfacil.files.wordpress.com/2012/05/placeanddirection_4622.gif