Hi Kanno, I usually top at 1/3 distance to the top of my tent and train the two top shoots/branches out horizontal until the next layer down come up, then I bring them down to the same level to wait for the third set of nodes to grow there and on and on working at a flat canopy along the way. When they get all up and level I take all the tiny branches below a line I draw in my mind off and leave the leaves on. Just what won't get light goes. Flip, wait 21 days or so and see exactly how well the plant did. I cut whole branches off if they don't get tall enough and take any inner branch growth off leaving all leaves on now. My vegging time is usually 65 to 70 days. That's the way I do it.