Chopped Onions:
To chop an onion, it is best to first cut it in half lengthways, so it will lay still on the chopping board.
Then slice lengthways starting 1.5 cm from the root (1, 2, 3, etc) and cutting towards the tip. Do not cut into the root end.
Then cut laterally, starting from the tip end and working towards the root (A, B, etc). Discard the root.
Coarsely chopped, chopped, and finely chopped are just a matter of scale.