Hole number
The hole number tells you where to place your mouth. On a 12-hole chromatic, beginners usually start around holes 5-8.
Breath direction
Every tab needs blow or draw. If a tab only says 5, you still need to know whether that means 5 blow or 5 draw.
Slide position
Slide out means the normal button position. Slide in means press the button while playing that blow or draw note.
5 blow = C55 draw = D55 slide blow = C#55 slide draw = D#5