The main aim of a knowledge base article is to show your customer how something can be done, either on your website or with your product.
Every such article starts with a question. You want to give your customers the means to handle a problem on their own through self-service. Over the course of an article, customers learn how to deal with a problem. If they have any follow-up questions, you should have articles ready for them too.
If you want to create a knowledge base, you need to fill it with articles. Read on to learn how to do that.