Does anyone know where I can find ideas to create in pure html5?

Answer 1

Look at your own life and showcase one of your personal interests

If you like cooking, write recipes.
If you like football, write about your team.
If you like Samba, write about dance techniques.

As Lisa said, dress it up later with CSS & JS as you improve

Answer 2

Google?

Or create a simple form or homepage? You can add css and Javascript later...

Answer 3

Thanks for the reply.