"All people there don't like it" = Exactly zero people like it "None of the people there like it" = Exactly zero people like it "Not all people there like it" = At least one person doesn't like it. You can logically figure out what 'not' negates by it's position. "Not all people..." - 'Not' negates 'all people'. "...do not like..." - 'Not' negates 'like'. I think it's the same in Chinese. 每个人都不喜欢它 = Everyone doesn't like it. 不是每个人都喜欢它 = Not everyone likes it. (Correct me if that's incorrect)

"not all that glitters is gold" can also be translated to "not everything that glitters is gold" "not all" basically means "not everything" however if instead of using "not all" you would use "not everything" in both of the sentences it would come out as - "not everything that glitters is gold" and "everything that glitters is not gold" do you see how changing the word made everything look different and changed the meaning? i hope this helped a little :)

亲爱的，部分否定和全部否定的语法知识点您的高中老师应该教过，还是淘气的您忘了呢？汉语依赖语序，外语就不一样了，习惯问题，熟悉就好。加油。