For simple statistics I use #GoatCounter. It's simple and #GPDR compatible by default. I also have experience with #Matomo. It's not GPDR compatible by default. You have to change the settings to anonymize data collections.
Matomo is far more advanced than GoatCounter. If you want to extensively see what happens on your website, Matomo is the way to go. Like you can track how many users stay 5 minutes in your website. And also realize which posts they like more, see bounce rate and so on.
Both GoatCounter and Matomo are blocked by anti tracking protections of Firefox.
Edit: If you are not sure which one is the right option for you, you can try hosted GoatCounter and see if you need more data from your visitors.