Your question is a bit ambiguous. You need to distinguish between <head> and <header>. The cassiopeia template index.php file contains this:
Is that what you are after? Otherwise there are are metadata fields in articles, menus and so on.
Code:
<head> <jdoc:include type="metas" /> <jdoc:include type="styles" /> <jdoc:include type="scripts" /></head>Statistics: Posted by ceford — Wed May 29, 2024 9:19 pm