Just came across these two wiki pages and read them. They are long reads, but worth the time to understand the items that Mueller is investigating. Really looking forward to Mueller's report since there is a lot of smoke to investigate, i.e. Russian offers to Trump, but no clear evidence that Trump "conspired". Russia seemed more interested in promoting violence between various factions across the US than helping Trump win by releasing Hillary's emails for example. Remember, Trump had no chance of winning, Hillary had the election won by a landslide, according to all the polls, so Putin needed to keep her emails available to blackmail her when she won.
Timeline of Russian interference in the 2016 United States elections - Wikipedia
Russian interference in the 2016 United States elections - Wikipedia
Timeline of Russian interference in the 2016 United States elections - Wikipedia
Russian interference in the 2016 United States elections - Wikipedia