All writers work differently. Few writers can write anything without an outline of some sort - more like a blueprint from which you can deviate as the need calls for it. Along the way, when creating content, it is not unusual for some writers to get stuck. Why? They don't plan their endings.
Regardless of what you are writing, be it a story or an article, plan the ending or conclusion first. As long as you know where you are going, you'll do your best to find the best or most direct route that will get you there.
For example if you are writing an article about marketing, and your conclusion contains the steps that are supposed to get you results, then obviously writing the main body of your article will be relatively easy.