I clone everything I grow. You never know when you will find that one, that you want to smoke again.
I usually root a topping if I take one, otherwise I take a lower that I would be pruning anyway.
And number of nodes doesnāt make much difference. I shoot for 2 to 3 inches because gravity doesnāt hurt too muchā¦
Rather than retype, hereās a link to a previous question.