Comments in WordPress is the standard, and easiest, way to allow user-created content on your site. Comments allow people to reply back to content, ask questions, and post their own information. For the most part, allowing comments is a good idea but it does come with it’s own set of problems.
A lot of what’s possible with comments comes in the form of WordPress settings. There are a lot of powerful settings available and getting them just right can be hard at first. There are also a number of different plugins out there that help you do even more with comments.