Joe Biden and Donald Trump will face off Thursday night for the first general-election debate of the 2024 presidential election cycle. Below, two political experts weigh in on what each candidate needs to do to win.

By Chris Whipple

Chris Whipple is the author of “The Fight of His Life: Inside Joe Biden’s White House” and “The Gatekeepers: How the White House Chiefs of Staff Define Every Presidency.”

1. Be energetic and engaged. Mr. Trump and his MAGA allies have tried to portray the president as a doddering geriatric who can’t complete a sentence. Simply appearing engaged, alert and coherent will be a victory for Mr. Biden. Mr. Biden would also do well to remember this fact: Incumbent presidents almost always lose the first debate. That’s true of even superlative political talents like Ronald Reagan and Barack Obama. Among the reasons for this are hubris and lack of practice; incumbent presidents are used to being saluted, not challenged.

2. Drive the contrast with Mr. Trump. Mr. Biden must recast the race from a referendum on his presidency to a stark choice between himself and Mr. Trump. “I used to say to President Obama, ‘If you’re on defense about your record, we’re losing,’” says Jim Messina, who ran Mr. Obama’s winning 2012 campaign. Mr. Biden should remind voters that his predecessor lost more jobs than any president since Herbert Hoover and cut taxes for the ultrawealthy and corporations. He should emphasize: “Donald Trump said he was going to pass an infrastructure bill. He couldn’t. I did. Donald Trump said he was going to bring back manufacturing jobs. He couldn’t. I did.

3. Outline a second-term agenda. Voters don’t reward presidents for what they’ve done; they want to know what they’ll do in the future. Mr. Biden should pick up on the American comeback narrative from his State of the Union speech and detail his priorities for a second term: codifying Roe v. Wade; cutting taxes for the middle class; extending student loans; combating climate change; and perhaps above all, making goods and housing affordable for working families. Admit that prices are too high and explain how he’ll bring them down. Mr. Biden can frame the election as a choice between a president who cares about the common good and a felon who cares only about himself and retribution.

4. Stress the threat to reproductive rights and democracy. These have been potent issues for Democrats in recent elections across the country. In November, they will be potent again. Mr. Biden should repeat Mr. Trump’s own words, like the former president’s boast, “I was able to kill Roe v. Wade,” and his remark that there should be “some form of punishment” for women who have abortions. If Mr. Trump asserts that he’s leaving abortion to the states, Mr. Biden can reply: “When he says ‘states’ rights’, he really means taking away a woman’s right. It’s code for outlawing abortion.”