Bud density

[stinkyattic]

actually one of my uncles friends who grows medicinal stuff says he either pinches or cuts the tolp of the bud off (dont remember which one he said exactly). which makes them rock hard...

That's not how it works. In fact, pinching off the top cola in early flower actually hurts yield- it's called 'topping' and redirects the plant's energy to lower nodes, but there's a tradeoff in lost yield from the prime cola, and the stress on the plant can cause hermaphrodites as well as slowing bud production.
There are all sorts of myths surrounding grow techniques...