Confused by all the news about Russia and the 2016 presidential election? We are here to help.

1 Russian cyberattacks 2 Links to Russian officials and intermediaries 3 Alleged obstruction 1 Russian cyberattacks 2 Links to Russian officials and intermediaries 3 Alleged obstruction 1 Russian cyberattacks 2 Links to Russian officials and intermediaries 3 Alleged obstruction

Most of the stories under the “Russia” umbrella generally fall into one of three categories.

1 Russia’s use of cyberattacks to interfere in the 2016 presidential election Hacking Propaganda D.N.C. Electoral boards Leaked emails Russian outlets Social media

In late 2016, top United States intelligence agencies concluded that the Russian government directed a massive cyberattack aimed at denying Hillary Clinton the presidency and putting Donald J. Trump in the White House.

2 Links between Trump associates and Russian officials and intermediaries Trump associates who: had contacts denied knowing others had contacts Paul Manafort Donald Trump Jr. Jared Kushner Hope Hicks K.T. McFarland Paul Manafort Michael T. Flynn Jeff Sessions Corey Lewandowski Jeff Sessions Roger J. Stone Jr. Carter Page George Papadopoulos Rick Dearborn

President Trump and his advisers have been dogged by revelations of undisclosed meetings, emails and phone calls between Russian officials and people connected to Mr. Trump during the campaign and presidential transition.

Some of Mr. Trump’s senior advisers denied knowing about any contacts with Russia. But new information indicates that several of them were aware of discussions, according to court documents and reporting.

It was also recently revealed that Donald Trump Jr. exchanged private messages on Twitter with WikiLeaks, the antisecrecy group that published Democratic emails stolen by Russian hackers.

On Friday, House Republicans released a previously secret memo in which they accuse senior officials at the F.B.I. and Justice Department of bias in the early stages of the Russia investigation.

3 Whether Mr. Trump interfered with investigations, including accusations of attempting to: Impede investigations Engage in a cover up Requests to end inquiries Prevent Sessions’s recusal Reasons for firing Comey Reason for son’s meeting with Russian lawyer

Here are some of the ways Mr. Trump may have interfered in the continuing criminal and congressional investigations:

• Mr. Trump admitted on national television that he had been thinking about the F.B.I.’s investigation into Russia’s interference in the 2016 election and possible coordination by Trump campaign associates when he fired the F.B.I. director, James B. Comey.

• Mr. Trump is said to have instructed the White House’s top lawyer to stop Attorney General Jeff Sessions from recusing himself, with the expectation that Mr. Sessions would shield him.

• Mr. Trump ordered the firing last June of Robert S. Mueller III, the special counsel overseeing the Russia investigation, according to four people told of the matter, but ultimately backed down after the White House counsel threatened to resign rather than carry out the directive.

• Mr. Comey testified under oath that Mr. Trump asked him to drop the investigation into Michael T. Flynn, the former national security adviser. Mr. Trump has denied he pressured Mr. Comey.

• Mr. Trump allegedly talked to his former chief of staff, Reince Priebus, about how he had called Mr. Comey to urge him to say publicly that he was not under investigation.

• Mr. Trump urged senior Senate Republicans, including the chairman of the Senate Intelligence Committee, to end the panel’s investigation.

• Mr. Trump may have helped write Donald Trump Jr.’s initial response to inquiries from The New York Times about a June 2016 meeting at Trump Tower with a Russian lawyer — a response he could have known was misleading.