I'm not sure if I'm doing this right

I’m doing the fourth User Story challenging which is creating a technical documentation page, and I need feedback if I’m doing it right. Also, I’m particularly not sure where to put the <nav> element? (Working on a new one)
Technical Documentation Page on HTML
Link to the challenge

The link to your pen gives a 404 error

I know I’m making a new one.

Should I remove this one?