Why do We Muslims Go By Hadith Why Can't They Just Follow Quran And Thats It? Part 2?

People are saying hajjs date is not in quran and it doesn't talk about sunnah & it doesn't talk about how to pray Do you guys even know what hajj means?it means where all the leaders of all the countries get together and talk about the crisis and takecare of what they have to takecare of & Quran talks about 5 times salah but it doesn't talk about how to pray but logically you do good things that is a prayer you eat thats another prayer you run a business thats another prayer salah means you have to do good things but praying the way we do right now its okay its not against it or anything because if you look at every person in masjid while praying every body is though differently some of them don't fasten there hands properly and some of them look around while praying & "unlogical" is a word please check the dictionary.People are saying that hadees were made in the time of prophet mohammed (PBUH) its a lie hadees came way after quran was made.created by 4 imams.