I’m curious - which of the items on the list
are true? (I honestly don’t know much about Mormons so I would appreciate a serious response.

)
Well, looks like I was banned, so here’s what I think before I get banned again
These are the ones that I know are fully true or semi-true:
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“God (the Father) was once a man like us”. As ParkerD already explained, this does not necessarily mean that the Father was not divine when He was a man, just like how Jesus did not stop being divine when He incarnated. However, yes, it is taught that the Father is an exalted man, and that He could have lived on another earth prior to being our God.
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“God (the Father) has a tangible body of flesh and bones”. Yes, this is a standard belief.
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“God lives on a planet near the star Kolob”. Yes.
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“God (“Heavenly Father”) has at least one wife, our “Mother in Heaven,” but she is so holy that we are not to discuss her nor pray to her.”. Yes, this is standard Mormon belief, that the Heavenly Father has a wife, Heavenly Mother. The rest is speculation, some say that we don’t know anything about her because the Father doesn’t want her name to be blasphemed, and other speculations. Mormons do not pray to her.
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"We can become like God and rule over our own universe. ". Mormons believe in exaltation, that you can become gods. I’ve seen at least one Mormon church manual that teaches that you will be given worlds. Mormons believe that you will become like Heavenly Father and Heavenly Mother, and will also have “eternal increase”, meaning, you will make spirit children as the Father did.
-"Jesus and Satan (“Lucifer”) are brothers, and they are our brothers - we are all spirit children of Heavenly Father ". Yes, we are all the spirit children of the Father, including Jesus Christ, the firstborn spirit child, and Satan (as well as all the demons). In Catholicism, we believe that the angels are a different order of beings than humans. In the LDS Church, angels are spirit children that either haven’t come to earth yet, resurrected personages, or humans that finished their life on earth and have some work to do before the resurrection. So, we are all the spirit children of God.
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“We should not pray to Jesus, nor try to feel a personal relationship with him.”. Well, I’m sure that Mormons “try to feel a personal relationship” with Jesus. They don’t pray to Him however, and only pray to the Father in the name of Jesus.
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The “Lord” (“Jehovah”) in the Old Testament is the being named Jesus in the New Testament, but different from “God the Father” (“Elohim”)." Yes, Mormons believe that Jesus is the Jehovah of the Old Testament.
-“In the highest degree of the celestial kingdom some men will have more than one wife.” Certain leaders of the LDS church may have said statements as such, however today that isn’t the case. Interestingly, a man can be eternally married to one wife, and if she dies, he is allowed to be eternally sealed to another wife (without a sealing cancelation). A woman however cannot be eternally married to more than one man, whether or not the first one died. Of course, today a man cannot be sealed to more than one living wife.
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“Before coming to this earth we lived as spirits in a “pre-existence”, during which we were tested; our position in this life (whether born to Mormons or savages, or in America or Africa) is our reward or punishment for our obedience in that life.”. Yes, Mormons believe in something called the “pre-existence” or “pre-mortal existence”. Many believe that our position in this life, as well as our talents, are based on what happened in the pre-existence.
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“Dark skin is a curse from God, the result of our sin, or the sin of our ancestors. If sufficiently righteous, a dark-skinned person will become light-skinned.”-Dark skin isn’t the curse, but is the sign of the curse.
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“You can identify a false angel by the color of his hair, or by offering to shake his hand.”-I don’t know about the color of the hair part, but yes, Joseph Smith did receive a revelation on the handshake part. It is currently in the Doctrine and Covenants scripture:
scriptures.lds.org/en/dc/129
"
4 When a messenger comes saying he has a message from God, offer him your hand and request him to shake hands with you.
5 If he be an angel he will do so, and you will feel his hand.
6 If he be the spirit of a just man made perfect he will come in his glory; for that is the only way he can appear—
7 Ask him to shake hands with you, but he will not move, because it is contrary to the order of heaven for a just man to bdeceive; but he will still deliver his message.
8 If it be the devil as an angel of light, when you ask him to shake hands he will offer you his hand, and you will not feel anything; you may therefore detect him.
9 These are three grand keys whereby you may know whether any administration is from God."