Tomorrow morning, Donald J. Trump will be sworn in as president of the United States of America. He'll be sworn in by Chief Justice John Roberts, and Vice President Mike Pence will be sworn in by Associate Justice Clarence Thomas. In attendance will be Presidents Barack Obama, George W. Bush, Bill Clinton, and Jimmy Carter (along with their wives). The theme of the inauguration is "Uniquely American" — since the inauguration itself is a uniquely American tradition.
What happens next? President Trump gets to work leading the US, with the help of his cabinet. His nominees are currently in hearings in the Senate; to learn more about who is nominated for which position, check out this study set. Betsy DeVos is President Trump's nominee for Secretary of Education. If she's confirmed, she'll be in charge of the Department of Education.