This is the 543rd most frequent Finnish word.
tieto
"Knowledge" or "information."
Here, 'tieto' means 'knowledge,' used as the subject of the sentence in its nominative case.
Tieto on valtaa, sanotaan usen.
Knowledge is power, it is often said.
In this sentence, 'tietoa' is the partitive case of 'tieto,' used to indicate some or unspecified quantity of information.
Minulla on tärkeää tietoa projektista.
I have important information about the project.
In this sentence, 'tieto' is used in a general sense to mean 'knowledge' as a concept.