Nietzsche´s Relativism answers

1.Nietzche understands the concept of truth as a mobile army of metaphors,metonyms and anthropomorphism that fells like something canonical that binds with the believes of a nation, becoming the truh itself as nothing more than an illusion.

2. They used metaphors,metanyms,anthropomorphism to explain how the truth belongs to them  as part of these concepts .
examples
metaphor: is raining in my eyes,meaning that somebody is dropping tears from his eyes
metonym: New York does not sleep, meaning that the people of new yok stay awake for the mayority of the night
Anthropomorphism: bugs bunny and mickey mouse whom are animals that acts like a normal human being.

3.Because the current society impose us the things that are seeing as truth as something mandatory so we come to desire or to fell the need of lying as something obligatory as a mean to something more convenient.

4.Truth is made of the habits that we as a society have come to see like something good or part of the reality basically the truth is made of illusions that have been forgotten as such thing and have become something impose as a reality.

5.Language and art are arbitrary,because each one has the problem of subjetivity ,so they can lead you to a subjetive truth.