If you want to see which of your blog’s visitors are returning, you can use the Google Analytics tracking code. This code will automatically send anonymous data about your visitors’ activities on your website to Google.
You can then view this data in Google Analytics, or use other tools to analyse it.
The most important thing to remember is that Google Analytics data is only as accurate as the code that you include on your website. If you do not have a Google Analytics account, or if you do not want to share your data with Google, there are other ways to track visitor behaviour on your website.
Overall, using Google Analytics tracking code is an effective way to track which of your blog’s visitors are returning. However, be sure to account for inaccuracies in the data by using other methods as well.