hash is a collection of the crystals on your weed. the weed is siffted through a tightly meshed screen so little to no leaf material can get through....only trichomes. both water methods and dry methods use the same principal. the golden powder is then collected and pressed togather. you can press it between your fingers and roll it around until it gets compacted. some people wrap it is cellophane and put it in their shoe for a few hours, some put it in the oven for a few minuites and then roll it with a dolling pin, and some use presses. i will have a step by step screen method in a few months that i will post up, but this video may help.