Today marked the first day of testimony in Sean “Diddy” Combs’ sex trafficking trial, where he faces five criminal counts in a case expected to last eight to ten weeks. Combs faces five criminal counts: one count of racketeering conspiracy; two counts of sex trafficking by force, fraud or coercion; and two counts of transportation to engage in prostitution. Combs has vociferously denied the allegations against him. Here's what you need to know from MSNBC’s Kristy Greenberg who was in the