ONTO/INTO

Two interesting words that we take for granted in the English language are “onto” and “into.” Like “to,” they are both prepositions, created akin by combination with that other preposition. But they each have an adverbial portion as well, and that's where the fun begins:

“Onto” and “into” of prepositions are, 
Pointing us forward while standing before.
Signs at the crossroads of grammar and tar,
Granted the basics of “on,” “in,” at core.

“On” as an adverb is separate from “to,”
Keeping its distance like “in” does at times.
Both near the “to” may shift backward the view,
Favoring the verb as the focus sometimes.

Joined up instead with their oneness declared,
“Onto” and “into” must look forward true.
Split, though, that view may no longer be shared,
Weightier allegiance to verb could be due.

“On” in the context of pointing ahead
Offers up “onto” and “on to” as well.
Free of direction, like lying on bed,
“On” itself offers, however you tell.

Think of that place that sells pastries and more;
People did see you as there you got nigh.
Driven by purpose, you strode “in to” store, 
Eyes bright and shining and fixed “onto” pie.

How you went “in” there of interest was more,
Emphasis subtle but backward from “in.”
Testing the “on” when already through door,
Featured a future of gustatory sin.

“On to” was option since offering up both
Rear-facing adverb and front-looking prep.
Lacking resourcefulness, others may loathe,
Wish for this “on to” a desperate misstep.

Whether with “on to” or “onto” one goes,
Often is doubtful, the factors not strong.
Govern decisions with study that shows
Which is the word that would most there belong.