This is the 446th most frequent Icelandic word.
fjallað
"Fjallað" means "discussed" or "dealt with."
Here, 'fjallað' is used in the sense of 'discussed' or 'dealt with', often related to addressing a matter or subject.
Ég hef fjallað um þetta efni áður.
I have discussed this topic before.
In this sentence, 'fjallar um' means 'is about' or 'deals with the topic of', showing its use for describing the content or subject of something.
Bókin fjallar um sögu Íslands.
The book is about the history of Iceland.
Here, 'fjallað um' is used in future tense format to indicate discussing or addressing the importance of education.