I got a lot Q with ASO(Google play) I know the App name and first 167 words of app description matters. But I found several apps keyword is "youtube music", they ranked top 5 without "youtube music" in app name or description. How did they achieve that? A. if by backlink, __1) what kind of backlink? __2) Backlink's Quantity > Quality? ____a. If Quality counts, backlinks' site should ranked by alexa around? ____b. if quantity counts, how many? __3) would backlinks' URL traffic boost my keyword rank in google play? B. if by App Reviews __1) User's comments contain keyword work better than backlinks? C. if by Press review or news __1) "alexa top 2,000 site with keyword backlinks but nonsense article" v.s. "alexa rank 20,000~200,000 no keyword backlinks but a nice app review", which works better?