multiple harvests

I have heard of a few methods to harvest your buds and then put the plant back in to veg growth. can anyone clarify this for me? I can imagine if it were easy everyone would be doing it though....

you can trim the top and leave the bottom leaves but its a lot of roots to deal with and you must re fertilize the soil but you can definitely do it.

learn to clone and youll never worry about anything. keep a mother or twelve if you have the room. cut and fill tables as needed. just work out the calendar.

could use a bonsai technique when i re-pot and trim the roots. does anyone know if the potency would be better the stronger the plant?