I'm not the greatest at grammar, but I think the very first one is incorrect. It should just be a comma, then the second just a comma as well, but the last one is correct. (I have no idea, I am sorry if you get it wrong.)
Sentence 1: Opinion Sentence 2: Fact Sentence 3: Fact Sentence 4: Fact Sentence 5: Fact Sentence 6: Fact Remember, a fact is a statement that can be proved to be true and opinions are what people think.
