HTML, or HyperText Markup Language is a type of script that
can be used to create the layout and contents of a website.
It consists of tags and elements. A tag
indicates the styling or function of something, while an element
is a named component of the HTML file, like a section.
For example: to make text bold it needs to be placed
inside the "<strong>" tag. Whenever tags are opened, they need to
be closed too, with a "</strong>" tag, for example.
Additional options can be placed inside the tags, for example:

This page has very simple and readable HTML, and a hidden flag!
You can inspect it via the Web Developer Tools, which you
can select from your browser's application menu.
Usually it's located at:
application menu -> tools -> web developer tools
but it can also generally be accessed by pressing F12!
From here you can select the Inspector tool to view HTML.

Alternatively you can write "view-source:" in front of the URL.
To learn more about HTML, check out
here.
Happy flag hunting!
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