If you want to write articles about trending topics, then trying to keep up-to-date with everything happening in your niche can be a full-time job in itself. Fortunately, there are tools and techniques available that can help make this process easier. Content about trending topics is beneficial because you know that what you’re writing about is already popular. There’s likely to be good search volume and it’s something that is top of mind for your target audience. Of course, evergreen content is also great. You will likely want to mix up your posts with a combination of evergreen and trending topics.
Source: 10 Ways to Find Trending Topics and Ideas for Your WordPress Blog Posts – WPMU DEV