1. One of the simplest approaches might be to use what’s called a Global module, which is available in a page builders (such as Elementor, Beaver Builder, Divi or Architect.
You can also create Layouts inside Beaver Builder (via Beaver Themer) that apply to all your pages or just parts of certain types.

I recommend that approach since today’s page builders work with most Themes (if not, you can switch to the Free Astra Theme or another page builder-friendly theme). See Page Builder links below, two have free versions, and that’s all you need.

WP Beaver Builder: https://wpbeaverbuilder.com

Elementor: https://elementor.com/

Architect: https://thrivethemes.com/architect/

2. Yep! ??

Hope that helps!

Regards,
JD

Thank you for the help.

I was looking for something in the free price range.

Is this not something that can be done with plugins via WP?

I googled “Global content” and found this Blog Post also gives steps on how to create Reusable Content Blocks using a free plugin:

https://www.wpexplorer.com/wordpress-reusable-content-blocks/