sugar leaf or sweat leaf are just the leaves poking out the buds, the fan leaves have the long stems and very little trichs falling on them, but the sugar leaf is what is growing out of the buds and is always covered in trichs, its what is used to make hash or any other extraction method,
when you trim the buds you usually cut the sugar leaf off as close to the bud as possible then you collect all these leaves until you got enough to make hash or butter or what ever else you want to do with it.
basically anything that has trichomes on them which is anything that looks frosty are worth keeping so you can then save them up and use them to make something with, some growers leave them on the buds and smoke them with the bud but most prefer to trim all the leaves back so your left with just the bud, this is the method i use as i prefer to smoke bud with as little leaf as possibe, how ever i have smoked trim and it does the job but not as nice as smoking the bud
when you trim the buds you usually cut the sugar leaf off as close to the bud as possible then you collect all these leaves until you got enough to make hash or butter or what ever else you want to do with it.
basically anything that has trichomes on them which is anything that looks frosty are worth keeping so you can then save them up and use them to make something with, some growers leave them on the buds and smoke them with the bud but most prefer to trim all the leaves back so your left with just the bud, this is the method i use as i prefer to smoke bud with as little leaf as possibe, how ever i have smoked trim and it does the job but not as nice as smoking the bud