I started to experiment with static website generators. Why use one instead of sticking to a CMS such as WordPress ?

Static sites response time are faster because there is no database connection. But static websites cannot persist any data, meaning that no one can post comments.
In short, static site features are more limited than WordPress. If you only need a single page application or few pages, go static.

I created a simple website https://chenon.app with Hugo for my portfolio and freelance activities.

staticgen.com is great start which platforms to choose.