Simply navigate to the tab/section you want the RSS feed for and append /rss next to and you get the RSS feed URL for that section. Similar to getting the RSS feed of a topic, the same technique can be applies to get the RSS feed URL of the particular section of a topic. Here I have navigated to "technology" topic and adding /rss next to is the RSS feed of that topic. Topic ID is something which look like this CAAqJggKIiBDQkFTRWdvSUwyMHZNRGRqTVhZU0FtVnVHZ0pKVGlnQVAB which can be seen in the URL. This will display the latest news in that topic. You can apply the same to any topic you find on Google news. The resultant URL is the RSS feed of that topic.
To get the RSS feed by topic, simply visit the topic you want i.e Business, Sports, Technology like below and append rss next to. Just append RSS to the and you get the RSS feed of the top stories of your location. The RSS feed for top stories is the simplest one. Follow this article below to find the feed URL as needed. You can get Google news RSS feed URL for top stories, by topic, geo location and even by language. You can read the same Google news in your own RSS reader, display it in your WordPress website using Super RSS Reader plugin, use automation services like IFTTT or Zapier to automate whenever any article is aggregated by Google news. It aggregates latest news across from multiple news sources and categorizes them based on trends, regions and topics.
Google news is a popular news aggregation service which is available in Google for a long time.