Not in the textbook
The Finnish nobody wrote down for you: the contractions, the dropped endings, the small words that carry a whole sentence.
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Your course taught you minä olen. Nobody says it. The gap between the two is not slang and it is not sloppiness - it is a second, regular system that Finns switch into the moment the writing stops, and it has rules you can learn in an afternoon.
These are the pieces that map it: which of the fifteen cases actually turn up in speech, where the stem moves, why one verb showed up in eighty-eight spellings in a single corpus, and what the filler words are doing while you are still parsing the first one.
The system itself is written out on the puhekieli page: the nine changes that turn the written form into the spoken one, and every pair this site has recorded.