Change the pitch of the natural hole note lowering its frequency. You can bend when the distance between the blow note and the draw is greater than a half step. You still can draw bend the 5th hole and blow bend the 7th, but not enough to reach another note but can be used for stylistic reasons. The way you put your mouth to play the harmonica. It's recommended that you practice both.
Some people use the U tongue position too.
You need to tongue block if you want to use tongue slap, or get some chordal or country sound or play octaves, blocking the center holes for example only the 1st and 4th holes. When you play single notes using tongue block, but on each note you start with an unblocked position, and quickly you do the block. You get a half tone over the draw reed. You blow trying to choke the blow reed with a little pressure and changing the air stream with your tongue. The easiest one is the 6th overblow.