... I can have 1 single master site that has all content. Then I want to have multiple child sites with with different members/administrators who can edit content for that specific site, and put into categories that will be displayed on the master. The master will publish all site content. I want ...

... of main site. Each site can either use own files or use same files for all sites (parked domains). 1) Does each site have its own admin panel to edit menus, forums, etc for that site only? Yes, each site has own admin panel as usual. All other database data except users will be unique per site ...

... does not appear on the fitness website. Same with articles etc. If this can be done a few questions. 1) Does each site have its own admin panel to edit menus, forums, etc for that site only? 2) Can I make someone an admin of just one the sites without giving them full access to all sites? Thanks ...

You need to use relative paths, in this case it will be fine.

Probably you don't understand: either parked domain xxx.site.com or symlink site.com/xxx means that this virtual site uses same files as main site. So you can add/edit/delete files in virtual site and main site will also get these changes.

... hosting panel of main site. 2. All sites will use same database tables, so ALL contents will be same. So no need to copy database tables. You can edit/delete/create article in any site and it will be changed in any site. But each site will use own menus and modules (you will need to copy current ...

... All sites (Main Site & All Child Sites) MUST use the same user & usergroup database from the Main Site. Usergroups for users will not be edited within the Child Sites. All usergroup assignments will be made via the Main Site. All sites can share users and usergroups, admin can edit all ...

... in for the Child Site the user is assigned to. Each site has own backend panel as usual, you can only see a list of sites in Main Site's backend, edit their global config and auto-login to backend. I know that in the Main Site, all users will be under Registered usergroup. We would also like to ...

It has related terms feature, so you can edit Term A, enter Term B as related.
Next Term B is displayed in 'See also' list of Term A and vice-versa.

... tables of main site (in either separate database or same database but with different tables prefix) and customizing each subsite as usual (edit template, modules etc.). Please ensure that your Joomla template doesn't store its settings in files but in database (database is used by Joomla ...

... let me know if this is possible. MightySites allows you to clone a database of any existing site once you create a new site. So next you can just edit settings, create site-specific categories and reconfigure it to display own contents only. I sent you installation instructions to help to understand ...