Use HTML constantly and probably feel it doesn’t have any more unknowns. There are some more specialized but very useful tags.
<meter> that represents a scalar measurement within a known range, or a fractional value.
<article> tag specifies independent, self-contained content.
<progress> tag represents the completion progress of a task.
The <aside> tag defines some content aside from the content it is placed in.
<pre> tag defines preformatted text.