You should know that they consider the Bible corrupt and untrustworthy and that the book of Mormon as the only trustworthy scriptures.
You should know that Mormon doctrine teaches that Jesus died only for the sins of Adam ("Original Sin") and for the rest he only shows the "Way of Salvation". You should know that Mormon doctrine is that in order to be saved you must believe upon Joseph Smith and Jesus. Not upon the Lord Jesus Christ alone.
Women should know that they will be Eternally Pregnant under Mormon doctrine and that their husbands have to call them to heaven or they will not be saved.
Just so you will know the Gospel is different; here is a quote from the Mormon "Journal of Discourses":
"Now, we will take the case of an individual who has broken all the laws of God and perhaps all the laws of man, and finally has shed the blood of a fellow-creature, and is condemned by the laws of man to die... A minister will come a preach to him, and tell him that all he has to do is to cast his soul on Jesus; that he has just to believe that Christ died for him ..so that he will have the fruits of righteousness and peace. ...the man [the criminal] believes this, he confesses Christ with his lips and acknowledges him with his tongue, and straightway is strung up between the heavens and the earth, and choked to death; his spirit is forced out of his body, and ushered into the presence of the eternal Father to stand before his spotless throne, and is deemed fit to dwell in the society of the pure and holy ones on high. That is according to the modern Gospel [the Bible], but not according to the ancient Gospel of Jesus Christ [Mormonism]..." LDS Prophet and President Charles W. Penrose, Journal of Discourses, Vol. 21, p. 84, 1880.
I asked you in an earlier thread for a reference on that. I ask again. What is your reference that this is taught as Mormon doctrine?