Special counsel Robert Mueller has completed his report on possible links between the Trump campaign and Russia during the 2016 presidential election. In May 2017, the Justice Department appointed Mueller, a former FBI director, to oversee the investigation.

Since then, Mueller’s investigation has unearthed numerous crimes, some related to the Russian collusion question and some not, that have led to indictments or guilty pleas from 34 individuals and three companies. This includes six former Trump advisers, 26 Russian nationals, one California man, three Russian companies, and one London-based lawyer. Seven of these 34 people have pleaded guilty to crimes. That number includes five former Trump associates who have pleaded guilty or been convicted: Paul Manafort, Michael Cohen, Michael Flynn, George Papadopoulos, and Rick Gates.

Mueller has now completed his report and made a partially redacted version public. This guide will help you understand everything you need to know about this story, from the crimes to the key players to how it all connects to President Trump — and what it could mean for his administration.