What were the contributions of the Hittites?

Answer 1

The Hittites may have been among the first to work meteoric iron for use as a precious metal in such things as thrones and ceremonial daggers. There is no evidence that they know how to produce iron cost-effectively enough, and to make it hard enough, to use as weapons of war.

Probably the most important Hittite contribution is to modern history. Hittite diplomatic tablets tended to include long preambles about negotiations that had gone before, and about the history of relations between Hatti and other nations.