If you have limited time, but want to see Tiananmen Square. Be prepared, you can't just go there. If it's the weekend, then there are even more people. According to the documents, the entrance to the square is through the control points. Therefore, there are queues and you need a reserve of time. Security in China is taken seriously.
There is a life hack. You can negotiate with the taxi driver, who are standing in a lot around the square. And he can do several laps at an average speed from the amount of 100-300 yuan, as agreed. Check-in is free for taxis. Even in the car, but for that, with my own eyes)