How can I grow 1 long cola instead of tiny little ones

Ive seen plenty of pics where people have grown their plants in such a way that at the end of the harvest they have 1 long bud from each plant but when some noobies begin to grow they end up with tiny buds here and their.

What is the secret?

one long cola... do NOT top, probably after vegging a few weeks you can trim the lower leaves and branches so the plant will devote all energy to producing the top cola

a lot of people will just flower clones immediately after they root and end up with one main cola

others can probably chime in and help more