This is the 4720th most frequent Russian word.
журналистского
"Журналистского" means "journalistic" in English.
Here, "журналистского" modifies "опыта" (experience), indicating that the experience is related to journalism.
У него много журналистского опыта.
He has a lot of journalistic experience.
In this sentence, "журналистского" is describing "подхода" (approach), emphasizing that the approach is characteristic of journalistic methods.
Автор использовал журналистского подхода для раскрытия темы.
The author used a journalistic approach to develop the topic.
Here, "журналистского" modifies "исследования" (investigation), referencing its nature or affiliation with journalism.