The First Continental Congress was concerned mostly with economic responses to British actions.
The First Continental Congress was called largely in response to the Coercive Acts, which were imposed by the British after the Boston Tea Party. The Congress spent a great deal of time considering how to respond. They eventually decided to respond with an economic boycott. They voted to ban both importation of goods from Great Britain and exportation of goods to Great Britain unless the British government agreed to their demands.
This economic boycott of Great Britain was by far the most important actual action taken by the Congress. However, the Congress was important simply by the fact that it met at all. This was one of the first important moves towards uniting the colonies and, eventually, creating a new country.