I'm going too answer this by first talking about the "mormonism" that you'll hear about from poor quality sources, and then talk about the Church of Jesus Christ of Latter-Day Saints. If you want me to elaborate on any point, feel free to ask.
The "mormonism" that you'll hear about from poor quality sources: a low quality source will tell you that "Mormons" worship Joseph Smith, are polytheists, polygamist, don't believe in the Bible, believe that works earn salvation, believe in a "created Jesus", are brainwashed, don't study scripture, don't know what they "really believe", are lairs etc.
The above^ is a complete straw man. No one actually believes that. Low quality sources rely on this strawman, taking quotes out of context, spinning, and then use threats and fear based tactics (ye' olde burning alive threat) to convince people to continue on this cycle of ignorance (and sometimes to continue to pay the people literally selling your this story).
Now talking about the Church of Jesus Christ of Latter-Day Saints: this church is about Jesus Christ. About loving and following Him. The Bible is revered as the word of God and thoroughly studied. Salvation is comes via faith in Him. Prayer and seeking God are HIGHLY regarded and encouraged. Joseph Smith is regarded as a prophet, but he's also a flawed man and should never be worshiped (would you worship Peter?).
It's extremely different than that strawman "mormonism" picture painted by "anti cult" groups. Speaking personally, it makes me laugh when people try to character assassinate the "worshiped" Joseph Smith, when I readily acknowledge that he had many flaws. My testimony really isn't about him, but rather about the Son of God, Jesus Christ.
Sidenote: there are a few break offs fro the Church of Jesus Christ of Latter-Day Saints that are also sometimes called "mormon". These are completely separate groups with different beliefs. They are also usually very small numerically. If you want me to talk about them and those differences, I can.