Short answers, pulled from the story.
The United Nations General Assembly voted to establish the United Nations Human Rights Council on the 15th of March 2006. This decision replaced the previous Commission on Human Rights which had lost credibility due to its inconsistent record and political maneuvering.
The United Nations Human Rights Council consists of 47 member states elected for staggered three-year terms. No country can hold a seat for more than two consecutive terms before stepping down from the council.
The headquarters of the United Nations Human Rights Council sits at the United Nations Office in Geneva, Switzerland. Members must be elected by the General Assembly through a majority vote of those present and voting.
The United Nations Human Rights Council investigated Lebanon following allegations that Israel systematically targeted civilians during the conflict. The body also accused Eritrea's government of extrajudicial executions under President Isaias Afwerki and confirmed that six Myanmar generals should face prosecution for war crimes related to the genocide against Rohingya Muslims.
The United States initially refused to seek membership under President George W. Bush arguing the body lacked credibility. It withdrew observer status entirely by June 2008 but rejoined in March 2009 under Barack Obama before Donald Trump pulled out again in June 2018 citing chronic anti-Israel bias.