It will really be better for you if you search tag questions yourself White Cat. It is not something to tell in a few words here. But generally, you look for confirmation with this kind of questions.
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White Catit was my first post in that forum , was not it ? - I used to have the same error, it think it should be "It was my first post in that forum, was it not?"
White Catthree kinds of question
The three kinds of questions that your teacher is referring to are:
1. Factual Question (A factual question has but one correct answer).
2. Interpretive Question (Inference - has more than one correct answer because a difference of opinion about meaning is possible).