Is it possible to add metadata to a Wordpress site without a Plugin?

[Jake]

You probably need that plugin, by the way the original te All-In-One SEO plugin is known to be a processor hog, some hosts forbid it's use, there are more modern SEO plugins that add similar meta data fiends for you to fill in.

These automated optimization ranking tools probably don't accurately know the actual effect on search raking these changes make, actual content enhancements may be a bigger aspect.

It's been a while, but I thought you could install plugins from within Wordpress, providing your not on a restricted host that may be using the multi user version.