into
The preposition into is usually used with verbs of movement. You use into to say where someone or something goes, or where something is put.
I went into the yard.
He poured tea into the cup.
After verbs meaning put, throw, drop, or fall, you can use into or in with the same meaning.
Chen put the letter into his pocket.
She put the key in her purse.
He fell into a pond.
One of the boys fell in the river.
Before here and there, use in, not ‘into’.
Come in here.
Put your bags in there.