All the contents in the package to be <html> </ html> intermediate
<Body> </ body> intermediate is visible page content
<H1> </ h1> intermediate is based on different numbers, titles of different sizes, the write / h seemingly not much greater than normal difference between segments
In order to produce bold text and do not use the h mark
<P> </ p> content intermediate the paragraph
Use extension .htm and .html without any distinction
In vscode which is written about the need to pay attention, do not press directly saved ALT + B (Open in browser) out of the last result