I would probably go to that thing up near the top corner.... its got a magnifying glass beside it.... some call it a 'search box'. Its like magic, you put some key words like h202, or hydrogen peroxide, or.... and hit 'search'. Then the oddest thing happens.... it displays a whole bunch or threads with the keywords you have put in to seach for. Or, if that sounds far too difficult, you could try some called 'google'. There, you may want to put into the 'search box' something like 'what is hydrogen peroxide used for in marijuana growing', or 'hydrogen peroxide in hydroponics'.... the point here is to do SOME of the leg work yourself. Buy a book, search and read and repeat. ....and don't get the 29% on your skin... it hurts like a mutha-fucka.