(Book of Mormon | 2 Nephi 9:27 - 43) is not a list of the key teachings of Mormonism, nor of the LDS teachings about multiple gods or LDS commandments required for eternal life.
It is indeed about
KEY teachings of The Church Of Jesus Christ Of Latter Day Saints. And so are these:
(Book of Mormon | 2 Nephi 25:23)
23 For we labor diligently to write, to persuade our children, and also our brethren, to believe in Christ, and to be reconciled to God;
for we know that it is by grace that we are saved, after all we can do.
(Book of Mormon | Moroni 8:10 - 14)
humble themselves as their little children, and they shall all be saved with their little children.
11 And their
little children need no repentance, neither baptism. Behold, baptism is unto repentance to the fulfilling the commandments unto the remission of sins.
12 But little children are alive in Christ, even from the foundation of the world; if not so, God is a partial God, and also a changeable God, and a respecter to persons; for how many little children have died without baptism!
13 Wherefore, if little children could not be saved without baptism, these must have gone to an endless hell.
14 Behold I say unto you, that he that supposeth that little children need baptism is in the gall of bitterness and in the bonds of iniquity; for he hath neither faith, hope, nor charity; wherefore, should he be cut off while in the thought, he must go down to hell.
(Book of Mormon | 1 Nephi 14:10 - 12)
10 And he said unto me: Behold there are save
two churches only; the one is the church of the Lamb of God, and the other is the church of the devil; wherefore, whoso belongeth not to the church of the Lamb of God belongeth to that great church, which is the mother of abominations; and she is the harlot of all the earth.
11 And it came to pass that I looked and beheld the harlot of all the earth, and she sat upon many waters; and she had dominion over all the earth, among all nations, kindreds, tongues, and people.
12 And it came to pass that I beheld the church of the Lamb of God, and its numbers were few, because of the wickedness and abominations of the harlot who sat upon many waters; nevertheless, I beheld that the church of the Lamb, who were the saints of God, were also upon all the face of the earth; and their dominions upon the face of the earth were small, because of the wickedness of the great harlot whom I saw.
(Book of Mormon | Moroni 10:3 - 25)
3 Behold, I would exhort you that when ye shall read these things, if it be wisdom in God that ye should read them, that ye would remember how merciful the Lord hath been unto the children of men, from the creation of Adam even down until the time that ye shall receive these things, and ponder it in your hearts.
4 And when ye shall receive these things, I would exhort you that ye would ask God, the Eternal Father, in the name of Christ, if these things are not true; and if ye shall ask with a sincere heart, with real intent, having faith in Christ, he will manifest the truth of it unto you, by the power of the Holy Ghost.
5 And by the power of the Holy Ghost ye may know the truth of all things.
6 And whatsoever thing is good is just and true; wherefore, nothing that is good denieth the Christ, but acknowledgeth that he is.
7 And ye may know that he is, by the power of the Holy Ghost; wherefore I would exhort you that ye deny not the power of God; for he worketh by power, according to the faith of the children of men, the same today and tomorrow, and forever.
8 And again, I exhort you, my brethren, that ye deny not the gifts of God, for they are many; and they come from the same God. And there are different ways that these gifts are administered; but it is the same God who worketh all in all; and they are given by the manifestations of the Spirit of God unto men, to profit them.
9 For behold, to one is given by the Spirit of God, that he may teach the word of wisdom;
10 And to another, that he may teach the word of knowledge by the same Spirit;
11 And to another, exceedingly great faith; and to another, the gifts of healing by the same Spirit;
12 And again, to another, that he may work mighty miracles;
13 And again, to another, that he may prophesy concerning all things;
14 And again, to another, the beholding of angels and ministering spirits;
15 And again, to another, all kinds of tongues;
16 And again, to another, the interpretation of languages and of divers kinds of tongues.
17 And all these gifts come by the Spirit of Christ; and they come unto every man severally, according as he will.
18 And I would exhort you, my beloved brethren, that ye remember that every good gift cometh of Christ.
19 And I would exhort you, my beloved brethren, that ye remember that he is the same yesterday, today, and forever, and that all these gifts of which I have spoken, which are spiritual, never will be done away, even as long as the world shall stand, only according to the unbelief of the children of men.
20 Wherefore, there must be faith; and if there must be faith there must also be hope; and if there must be hope there must also be charity.
21 And except ye have charity ye can in nowise be saved in the kingdom of God; neither can ye be saved in the kingdom of God if ye have not faith; neither can ye if ye have no hope.
22 And if ye have no hope ye must needs be in despair; and despair cometh because of iniquity.
23 And Christ truly said unto our fathers: If ye have faith ye can do all things which are expedient unto me.
24 And now I speak unto all the ends of the earth—that if the day cometh that the power and gifts of God shall be done away among you, it shall be because of unbelief.
25 And wo be unto the children of men if this be the case; for there shall be none that doeth good among you, no not one. For if there be one among you that doeth good, he shall work by the power and gifts of God.
Ant there are lots more, too many to list here.