This is the 110th most frequent Czech word.
zejména
"Zejména" means "especially" or "in particular" in English.
In this sentence, 'zejména' stresses that young people are the primary group of concern or most affected by the issue. It specifies the group among a possibly larger affected population.
Tento problém trápí zejména mladé lidi.
This issue troubles especially young people.
Here, 'zejména' highlights that politics is the main topic of interest for journalists, possibly among other areas they might also follow to a lesser extent.
Novináři se zajímají zejména o politiku.
Journalists are interested particularly in politics.
The word 'zejména' is used here to emphasize that the focus should particularly or especially be on the key points. It indicates a priority or importance assigned to the mentioned aspect.