Key Points:
Beijing is one of the top cities to visit in the world.
Earth Trekkers has provided a pretty good travel guide for Beijing.
The primary things to do in Beijing include: The Forbidden City, Tian'anmen Square, and the site of the 2008 Summer Olympics (1 day), The Temple of Heaven and the Summer Palace (1 day), The Great Wall of China (Mutianyu and Jiankou) (1 day).
According to Wikipedia, "Beijing, alternatively romanized as Peking, is the capital of the People's Republic of China. It is the world's most populous national capital city." "Beijing is a global city and one of the world's leading centres for culture, diplomacy, politics, finance, business and economics, education, research, language, tourism, media, sport, science and technology and transportation. A megacity, Beijing is the second largest Chinese city by urban population after Shanghai and is the nation's cultural, educational, and political center. It is home to the headquarters of most of China's largest state-owned companies and houses the largest number of Fortune Global 500 companies in the world, as well as the world's four biggest financial institutions by total assets. It is also a major hub for the national highway, expressway, railway, and high-speed rail networks. The Beijing Capital International Airport has been the second busiest in the world by passenger traffic (Asia's busiest) since 2010, and, as of 2016, the city's subway network is the busiest and longest in the world. The Beijing Daxing International Airport, a second international airport in Beijing, is the largest single-structure airport terminal in the world."
Here we quote the best way to travel in Beijing provided by Earth Trekkers, a very good travel website created by an around-the-world traveler.
It takes at least 3 days to visit Beijing, and the suggested itinerary is as follows:
Day 1: The Forbidden City, Tian'anmen Square, site of the 2008 Summer Olympics, Lama Temple, Confucius Temple.
Day 2: The Temple of Heaven, 798 Art Zone, the Summer Palace.
Day 3: The Great Wall of China (Mutianyu and Jiankou)
Check ChatGPT's answer for alternative itinerary.