what makes an effective introduction to a Wikipedia article

I think that an effective introduction would be to first explain the topic so that readers will know what the overall article is about. The introduction should also state facts, be very detailed, and flow efficiently. These things will help the reader to grasp and take in everything so that they will not be lost while reading through the article. The introduction should not jump right into a topic without first taking baby steps. You have to ease your readers into your article and the introduction is supposed to walk the reader through it.