the point being to allow more air flow and so the plant can concentrate on the main colas
just get rid of the bottom 1 or 2 nodes so 2 to 4 branchs and this is something you do depending on strain and what type of plant you are trying to create
i know poeple on the boards will argue that removing the branchs will cause stress and decrease photosynthesis which id agree with if i hadnt seen the green house seed co grows on youtube those blokes trim the branchs and grow the biggest yeilding and overall best plants ive ever seen
theyve won 30 cannabis cups and they created white rhino