Il vero scopo del viaggio è conoscere nuove culture.

In Italian, the adjective vero (“true/real”) usually comes before the noun to emphasize authenticity or importance.

• il vero scopo = “the real purpose” (focus on “real”)
• lo scopo vero would sound odd or overly emphatic and is rarely used.
  If you put vero after, it would mean “purpose that happens to be real,” which isn’t the intended nuance here.

Del is a contraction of the preposition di + the definite article il.

• di expresses possession or relation (“of”)
• il is the masculine singular “the”
  So del viaggio literally means “of the trip” or “of the journey.”

In Italian, after the verb essere (“to be”) you can link to another verb in the infinitive to express purpose or definition:

• lo scopo è fare – “the purpose is to do”
• lo scopo è conoscere – “the purpose is to get to know”
  This construction is similar to English “X is to do Y.”