Isn't doctype still required by the spec in HTML5 in order to be "proper"? Perhaps I'm mistaken but I thought I remembered that it's technically 'required'.
It is, but I'd argue that people wouldn't even notice that the document is in quirks mode.
I think you'd really only want a TITLE tag so that it appears as a tab name. Anything else is really optional for people and you'd only really need BR, A, and IMG
1. Use Notepad/TextEdit to create a plain text index.html.
2. Deploy index.html to Neocities or similar.
3. Add content with headings and images.
And only then going back to:
4. Make it proper HTML with <head> and <body>.
5. Upgrade Notepad/TextEdit to Visual Studio Code.