The difference between non login shells and supporting files and login shells and supporting files is confusing the hell out of me.

The word interactive is commonly used ... and the way I see it .. any login is interactive ... right ? I need to put a login name and password in to get past either login "type" ... so thats interactive. So I suppose I also dont understand "interactive"

So .. My question is can someone point me to a clear explanation of these concepts.

Something like
"A non-login shell is ..... "
"The following files support a non-login ... "

then something similar for login shells.

Thanks !!
Sum

supporting files?
cert? Certificate? Certification?

These words don't make a lot of sense in the order you've put them in. Can you step back and explain what you're trying to do and why?
Maybe read the INVOCATION section of man bash?

supporting files = files used / read while executing a particular shell

cert = studying for lpic1 / linux+

I have Tracys LPIC 1/Comptia Linux+ book and RHCE/RHSA by Joing. I read both man and info ... coincidentally both useless; neither written in plain understandable language. .. Im a 52 year old network engineer... so its not due to the lack of effort. Both have their uses .. but not here.
I cant answer these types of questions accurately unless
I understand which type of shell uses which specific bash configuration files

Then definitely read the INVOCATION section of the bash manual.