You use the fact that after some verbs or prepositions, especially in expressions such as in view of the fact that ,apart from the fact that, and despite the fact that, to link the verb or preposition with a clause.

You use the fact that instead of a simple that-clause either for emphasis or because the clause is the subject of your sentence.

You use in fact ,in actual fact, or in point of fact to indicate that you are giving more detailed information about what you have just said.

You use in fact ,in actual fact, or in point of fact to introduce or draw attention to a comment that modifies, contradicts, or contrasts with a previous statement.

When you refer to something as a fact or as fact, you mean that you think it is true or correct.

Facts are pieces of information that can be discovered.

You use as a matter of fact to introduce a statement that gives more details about what has just been said, or an explanation of it, or something that contrasts with it.

If you say that you know something for a fact, you are emphasizing that you are completely certain that it is true.

You use the fact is or the fact of the matter is to introduce and draw attention to a summary or statement of the most important point about what you have been saying.

You say the fact remains that something is the case when you want to emphasize that the situation must be accepted.

You say and that's a fact to emphasize the truth or correctness of a statement that you have just made.

You say is that a fact? as a response to a statement which you find surprising, interesting, or unlikely.