achieve

hey 420 peeps , when and how should i "top" a plant ? a few grows under my belt and would like to start trying new things........like mainlining and training, etc.....how can i achieve results like the pixs below ? or maybe you could point me in the right direction..................thanks all ...

Do you think you could achieve a gpw of 2.0 with led grow lights? How would you go about it if you think you could achieve that goal.