Clarify your audience - Know who your target audience is and Make personas to pin down their soreness details. Don’t test to focus on Everybody!?????? ?? ????? ????? ??? ???? ?? ??? ?? ????? ???? ?????, ???? ??????? ???????. ???? ?? ???????????? ????? ?????? ????????????? ???????????, ?????? ???? ?? ???????????? ????? ?????????.To make it simple