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They include the name and sex of the decedent, their age, marital status and occupation, nationality, place of birth, place, date and cause of death, and the date and place they were buried.
Almost all the libraries in Missouri have newspaper records.
Generally, if you know the name of the person you are researching but are not too sure about the date of death or whether there was an obituary published in a local newspaper, you can try one of the nationwide digital databases of obituaries and death notices.
There is a choice of these and for the most part they are free.
Missouri has ample resources in this respect, including death indexes, lists of death certificates complete with images, newspaper archives available online, and cemetery records.
Many of these resources are county-specific, which actually improves your chances of finding the obituary you need, or, if there is no obituary, a death record that contains relevant information.