You should just know how to create database, create database users and assign database users to databases. That is usually easily done in cPanel hosting panel. We can always with that if your hosting panel have these features, or you can ask your hosting provider. I sent you MightySites installation ...

... 4.racehelmet.com All these website need the exact content but different templates. Yes, that's possible, you will have a main site with own hosting account, all other domains will be parked domains, so all sites will use single hosting account (so same files). All sites will use same database ...

... have to come up with their own "articles" and chiropractic news, etc. That's possible but super admin should create a parked domain in hosting panel and next create a site in MightySites with cloning a database from a sample client's site. 2. That same client needs to have a website ...

I think that's possible, but please also ask your hosting provider if these domains will work.
Not really sure if cPanel allows to setup a parked domain for subdomain.

Yes, I guess MightySites can help here. You will have a main site with usual hosting account, all clients sites will be parked domains with own databases. So one Joomla installation for all sites will be used. You want "it would automatically flow out to ...

... of main site site.com will be able to create new sites in MightySites (note that you will need to create a parked domain custx.site.com in your hosting panel first). Admin will also be able to auto-login to backend panels of subsites and edit global config right from backend of main site if ...

... is parked on top of "siteA.com". Is that correct? Rick Yes, correct. Parked domain is visible to end user like usual domain with own hosting account. User can't even know if the domain is usual or parked.

... only domain name without folder is posible, eg. www.secondary.com or sub.secondary.com. So secondary.com shouldn't have own hosting account but it will be a parked domain to main site. For testing purposes you can create a dummy site like dev.main.com (also parked domain ...

... Joomla installation for all sites, so facilities sites will be parked domains for main site. 2) Yes, easy: you create a parked domain in your hosting panel first, next create a new site in MightySites with optional cloning of database of any current site (facility). 3) You can share content ...

... onto j3, rather the templates are uploaded along with j3 and content to a site's empty root folder. I want to lower my inode usage from my hosting company by shared use of joomla 3 for these sites, do you think that I can do this. I would have to some how configure MightySites then delete ...