While it initially launched to some raving reviews the public opinion on Civilization VI took a bit of a downward turn these past few months. Most of this comes down to the ridiculous AI that is more than willing to chop its own arms off in order to spite you. Depending on your playstyle you might not care about such annoyances, but it is difficult to tell before you actually get to experience it.
As such, I am very glad to say that the developers have now added a free playable demo on Steam, so you can easily see for yourself whether this is a deal-breaker or not! The demo only allows you to play the first 60 turns as Qin Shi Huang on a fixed map with America, Egypt, and Sumeria, but this should be more than enough to give you a good impression of what Civilization 6 is all about. And naturally, you can replay the demo as many times as you want.
If you're new to the whole series and need a bit of help before jumping in, the developers have also prepared a brief guide for new players. You can find it by heading over to the official website, and I would greatly recommend you read through it because it offers some genuinely good advice for beginners. Have fun!