Topping plants

When is the best time to top a plant and do you have any advice on how to do it?

Yes i top right after my clones take root in the cube........

top anytime after the 3rd node(3rd set of leaves) i like to wait untill the plants are nice and strong so they can support 2 main stems, find the very top of the plant and where the new sets of growth is going to stem from cut that bit off! i just nip it of with my nails. heres a good link https://www.rollitup.org/advanced-marijuana-cultivation/151706-uncle-bens-topping-technique-get.html