I am unable to clarify the difference between No and Not,
As per my knowledge I have read that "Not" is used with helping verb always but in the following question "Not" is used with main verb (Be). Is is right or wrong If right then plz define.
He is a good teacher
He is not a good teacher
Best Answer
No and Not are "not" interchangeable in the same way "Yes" and "Is" aren't.
Your examples;
"He is a good teacher" doesn't sound right when we say "He yes a good teacher", likewise "He is not a good teacher" is correct while "He is no a good teacher" is just wrong.
No is a great response where as Not describes the state of something. For example, "JAVA is not a real programming language". Did you ever learn JAVA? No, I did not.