Google updates its algorithm frequently. At times, they announce the major updates beforehand, at other times they inform after initiating one. The last update was rolled out on May 25th. To learn about such updates, we had to wait for tweets & official answers from the team.
Google thought of improving this process and has created a dedicated Google Search ranking updates page. With the help of this page, you can check all the latest and previous updates easily.
If you wish to learn how Google improves the search engine, there are several articles from Google to help you. Also, its blog page has more information related to the updates. This page is definitely important for all site owners and SEO experts.