Copic Sketch & Copic Ciao - what's the difference?
Medium Broad nib

Large area: Slant a marker & use the flat part. Fine lines: Use the edge. Dots: Use the edge
Super Brush nib

Hold the pen upright and draw a thin line with a tip of the Super Brush nib. Letting the nib flex on its side, draw a thick line. This method is recommended when colouring a large area.
Copic colour numbers

Copic colour numbers consist of 3 elements - the letters representing the hue (dominant colour family) and a set of digits, the first one indicating the color saturation and the rest representing the brightness of the colour.