Harmonica playing single blow notes!

Tonguing
this is the best way to play if youll be playing a chromatic harp.
.Blow into holes 4,5 and 6 making a chord.
.push your tongue forward against the holes so that only one hole is uncovered and sounds.
This can be either to the left or right of your tongue, but pick a side and stick to it.

Puckering
Whatever the name, many who pick up ont the harp play this way.
. tighthen your lips as if to whistle and blow into hole 4.
. try getting a single clear tone.