There was a hostage situation with Iran. The Iranian revolution took over our embassy in Terhan holding 52 hostages, demanding we send back their overthrown shah for his crimes. US policy is we don't give into blackmail. There was a failed attempt to free the hostages which killed 8 servicemen. Carter was considered a failure costing him reelection.
Nothing other than the Iran hostages, and the failed attempt at a rescue. He successfully signed the Camp David accords in 1978, a document that has been the foundation of Middle East relations until the Arab Spring. However, He focused on human rights, which led to abandoning the Shah and his being replaced by a regime that became a major opponent in the war against Muslim terrorism. The legacies of Carter's human rights gambits were just as mixed as their practice. Carter, more than any previous President, injected human rights considerations into American foreign policy, legitimizing these concerns in the process. But conservative Republicans like Jeanne Kirkpatrick, who would become U.S. representative to the United Nations in the Reagan administration, skillfully and successfully attacked Carter for supposedly undercutting American allies by criticizing their human rights' shortcomings. These attacks proved harmful to Carter during the 1980 election.