I know that God lives and loves us. I know that His words in the scriptures are real and true and that He has placed a prophet on the earth today just as He did in the days of old. That prophet's name is Thomas S. Monson. I've heard him speak and I know for a fact that he is indeed called of God to speak to his children today.
But this is only the basis. If you want to learn more, may I suggest www.mormon.org.
I wish not to debate this, it is only what I know. If you disagree, that's fine. If you are curious, I'll answer your questions to the best of my ability. But it is what I know.