Choose one small interaction
A button that changes one message is enough to create a real beginner interaction.
Public article
How to Build Your First Tiny Interactive Page
A beginner-first article on combining a button, an event, and a small DOM update into one page.
Use familiar building blocks
The strongest first project reuses the same ideas you already know instead of adding a pile of new ones at once.
Clarity is the real finish line
If you can explain what the page does and how the click changes the page, you have built something meaningful.