This is the 25th most frequent Norwegian word.
tidligere
Earlier; previously.
In this sentence, 'tidligere' is used as an adverb to indicate that the action (living in Oslo) took place in the past.
Han bodde tidligere i Oslo.
He previously lived in Oslo.
Here, 'tidligere' acts as an adjective to describe the noun 'erfaring' (experience), indicating it occurred before the current time period.
Tidligere erfaring er en fordel.
Previous experience is an advantage.
This usage of 'tidligere' as an adverb clarifies the timing of the action (being informed) as happening before now or another mentioned event.